{"action":"created","issue":{"url":"https://api.github.com/repos/Khan/khan-exercises/issues/160272","labels_url":"https://api.github.com/repos/Khan/khan-exercises/issues/160272/labels{/name}","comments_url":"https://api.github.com/repos/Khan/khan-exercises/issues/160272/comments","events_url":"https://api.github.com/repos/Khan/khan-exercises/issues/160272/events","html_url":"https://github.com/Khan/khan-exercises/issues/160272","id":25565731,"number":160272,"title":"Adding and subtracting rational expressions 5 - Wrong Hint Answer.","user":{"login":"KhanBugz","id":924247,"avatar_url":"https://avatars.githubusercontent.com/u/924247?v=3","gravatar_id":"","url":"https://api.github.com/users/KhanBugz","html_url":"https://github.com/KhanBugz","followers_url":"https://api.github.com/users/KhanBugz/followers","following_url":"https://api.github.com/users/KhanBugz/following{/other_user}","gists_url":"https://api.github.com/users/KhanBugz/gists{/gist_id}","starred_url":"https://api.github.com/users/KhanBugz/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/KhanBugz/subscriptions","organizations_url":"https://api.github.com/users/KhanBugz/orgs","repos_url":"https://api.github.com/users/KhanBugz/repos","events_url":"https://api.github.com/users/KhanBugz/events{/privacy}","received_events_url":"https://api.github.com/users/KhanBugz/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/Khan/khan-exercises/labels/chrome","name":"chrome","color":"e102d8"},{"url":"https://api.github.com/repos/Khan/khan-exercises/labels/snowleo","name":"snowleo","color":"ededed"},{"url":"https://api.github.com/repos/Khan/khan-exercises/labels/wrong-or-unclear","name":"wrong-or-unclear","color":"FFA500"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2014-01-14T10:45:15Z","updated_at":"2015-11-17T22:15:04Z","closed_at":null,"body":"The answer provided doesn't work.\n\n[adding_and_subtracting_rational_expressions_5.html?seed=63&problem=0](http://sandcastle.kasandbox.org/media/castles/Khan:master/exercises/adding_and_subtracting_rational_expressions_5.html?seed=63&problem=0&debug&lang=en)\n\n[Answer timeline](http://sandcastle.kasandbox.org/media/castles/Khan:master/exercises/adding_and_subtracting_rational_expressions_5.html?seed=63&problem=0&debug&lang=en&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22(7y%5E2-4y-24\\)%20%2F%20(6y%5E2-18y%2B12\\)%5C%22%22%2C52%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22(7y%5E2-4y-24\\)%20%2F%20(6y%5E2-18y%2B12\\)%5C%22%22%2C18%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22(7y%5E2-4y-24\\)%20%2F%20%20(3(2y%5E2-6y%2B4\\)\\)%5C%22%22%2C53%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22(7y%5E2-4y-24\\)%20%2F%20%20(3(2y%5E2-6y%2B4\\)\\)%5C%22%22%2C86%5D%5D)\n\n    [\"(7y^2-4y-24) / (6y^2-18y+12)\",\"(7y^2-4y-24) / (6y^2-18y+12)\",\"(7y^2-4y-24) /  (3(2y^2-6y+4))\",\"(7y^2-4y-24) /  (3(2y^2-6y+4))\"]\n\nLocale: en\n\nUser hash: 1090032305\n\nMozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36\n\nMathJax is loaded, ready, queue length: 0\n\n\n\nstart of log\nloadModule mod /khan-exercises/utils/answer-types.js\nloadModule mod /khan-exercises/utils/tmpl.js\nloadModule mod /khan-exercises/utils/tex.js\nloadModule mod /khan-exercises/utils/jquery.adhesion.js\nloadModule mod /khan-exercises/utils/calculator.js\nloadModule mod /khan-exercises/third_party/MathJax/2.1/MathJax.js?config=KAthJax-9e2776ffe7d2006f16f36d0d55d9464b\nloadScript loading /khan-exercises/third_party/MathJax/2.1/MathJax.js?config=KAthJax-9e2776ffe7d2006f16f36d0d55d9464b\nloadScript loaded /khan-exercises/third_party/MathJax/2.1/MathJax.js?config=KAthJax-9e2776ffe7d2006f16f36d0d55d9464b\nstartTask...\nstartTask got task adding_and_subtracting_rational_expressions_5\nrenderExerciseTask adding_and_subtracting_rational_expressions_5\nloading and rendering adding_and_subtracting_rational_expressions_5\nloadExercise start adding_and_subtracting_rational_expressions_5.html\nloadExercise got adding_and_subtracting_rational_expressions_5.html\nloadExercise submod math\nloadModule mod /khan-exercises/utils/math.js\nloadModule mod /khan-exercises/utils/../third_party/raphael.js\nloadModule mod /khan-exercises/utils/knumber.js\nloadExercise submod math-format\nloadModule mod /khan-exercises/utils/math-format.js\nloadModule mod /khan-exercises/utils/expressions.js\nloadExercise submod rational-expressions\nloadModule mod /khan-exercises/utils/rational-expressions.js\nloadExercise submod answer-types\nloadExercise submod tmpl\nloadExercise submod tex\nloadExercise submod jquery.adhesion\nloadExercise submod calculator\nloadExercise submod /khan-exercises/third_party/MathJax/2.1/MathJax.js?config=KAthJax-9e2776ffe7d2006f16f36d0d55d9464b\nloadExercise finish adding_and_subtracting_rational_expressions_5.html\nloaded adding_and_subtracting_rational_expressions_5, now rendering\nstart of makeProblem\nchose problem type and seed for adding_and_subtracting_rational_expressions_5\ncloned problem\ncloned global elements\nran tmplApply to vars and main elements\nran tmplApply to [id]\nremoved hints from DOM\nevaled inline scripts\nadded inline styles\n(answer-typesLoad not a fn; src undefined)\nrunning tmplLoad\nran tmplLoad\n(texLoad not a fn; src undefined)\n(jquery.adhesionLoad not a fn; src undefined)\n(calculatorLoad not a fn; src undefined)\nrunning mathLoad\nran mathLoad\n(../third_party/raphaelLoad not a fn; src undefined)\n(knumberLoad not a fn; src undefined)\n(math-formatLoad not a fn; src undefined)\n(expressionsLoad not a fn; src undefined)\n(rational-expressionsLoad not a fn; src undefined)\ndone with runModules Load\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\ndone with runModules\ndecided on answer type expression\nvalidator created\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\nMathJax done typesetting (\\qquad\\begin{align*}\n                        \\dfrac{3y + 4}{2y - 2} \\times \\dfrac{3y - 6}{3y - 6}\n                        & = \\dfrac{(3y + 4)(3y - 6)}{(2y - 2)(3y - 6)} \\\\\n                        & = \\dfrac{9y^2 - 6y - 24}{(2y - 2)(3y - 6)}\\end{align*}\n                    )\nMathJax done typesetting (\\qquad\\begin{align*}\n                        \\dfrac{y}{3y - 6} \\times \\dfrac{2y - 2}{2y - 2}\n                        & = \\dfrac{(y)(2y - 2)}{(3y - 6)(2y - 2)} \\\\\n                        & = \\dfrac{2y^2 - 2y}{(3y - 6)(2y - 2)}\\end{align*}\n                    )\nMathJax done typesetting (\\displaystyle 7)\nMathJax done typesetting (\\displaystyle 7y)\nMathJax done typesetting (\\displaystyle 7y^{3})\nMathJax done typesetting (\\displaystyle 7y^{3}-4)\nMathJax done typesetting (\\displaystyle 7y^{3}-4y)\nMathJax done typesetting (\\displaystyle 7y^{3}-4y-2)\nMathJax done typesetting (\\displaystyle 7y^{3}-4y-24)\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6})\nMathJax done typesetting (\\displaystyle \\frac{1}{6}\\frac{7y^{2}-4y-24}{y})\nMathJax done typesetting (\\displaystyle \\frac{1}{6}\\frac{7y^{2}-4y-24}{y^{2}})\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6y^{2}-1})\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6y^{2}-18})\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6y^{2}-18y})\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6y^{2}-18y+1})\nMathJax done typesetting (\\displaystyle \\frac{7y^{2}-4y-24}{6y^{2}-18y+12})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(6y^{2}-18y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(y^{2}-18y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-18y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-1y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-6y+12\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-6y+1\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{\\left(7y^{2}-4y-24\\right)\\left(2y^{2}-6y+4\\right)}{3})\nMathJax done typesetting (\\displaystyle \\frac{1}{3}\\frac{7y^{2}-4y-24}{2y^{2}-6y+4})\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nMathJax done typesetting (\\sqrt{x})\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)\n(answer-types not a fn; src undefined)\nrunning tmpl\nran tmpl\nrunning tex\nran tex\n(jquery.adhesion not a fn; src undefined)\n(calculator not a fn; src undefined)\n(math not a fn; src undefined)\n(../third_party/raphael not a fn; src undefined)\n(knumber not a fn; src undefined)\n(math-format not a fn; src undefined)\n(expressions not a fn; src undefined)\n(rational-expressions not a fn; src undefined)"},"comment":{"url":"https://api.github.com/repos/Khan/khan-exercises/issues/comments/157526552","html_url":"https://github.com/Khan/khan-exercises/issues/160272#issuecomment-157526552","issue_url":"https://api.github.com/repos/Khan/khan-exercises/issues/160272","id":157526552,"user":{"login":"KhanBugz","id":924247,"avatar_url":"https://avatars.githubusercontent.com/u/924247?v=3","gravatar_id":"","url":"https://api.github.com/users/KhanBugz","html_url":"https://github.com/KhanBugz","followers_url":"https://api.github.com/users/KhanBugz/followers","following_url":"https://api.github.com/users/KhanBugz/following{/other_user}","gists_url":"https://api.github.com/users/KhanBugz/gists{/gist_id}","starred_url":"https://api.github.com/users/KhanBugz/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/KhanBugz/subscriptions","organizations_url":"https://api.github.com/users/KhanBugz/orgs","repos_url":"https://api.github.com/users/KhanBugz/repos","events_url":"https://api.github.com/users/KhanBugz/events{/privacy}","received_events_url":"https://api.github.com/users/KhanBugz/received_events","type":"User","site_admin":false},"created_at":"2015-11-17T22:15:04Z","updated_at":"2015-11-17T22:15:04Z","body":"### This is an automated comment\n\nWe're closing all of the unverified issues opened by KhanBugz. Unfortunately we'll lose a lot of good bug reports by doing this, but the sheer volume of open issues (50,000+) makes it impractical for us to manually sort through everything.\n\nBug reports made through the KA site now go into another system (Jira), so it's likely that we already know about it there. But if you're still experiencing a problem, please report it again!\n"}}