If you horizontally stretch the quadratic parent function, K(x) = x2, by a factor of 3, what is the equation of the new function?

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.