What is the slope of the secant line for the function [math] f(x) = 3x^2+4x-1 [/math] through the points [math] x=-2 [/math] and [math] x=1 [/math]?
Is the function [math]f(x)=\frac{x^2–16}{x+4}[/math] discontinuous at [math]x = -4[/math]?