Question

If you vertically stretch the quadratic parent function, F(x) = x2, by multiplying by 7, what is the equation of the new function?

Answer 1

A. G(x) = 7x^2

B. G(x) = x^2 - 7

C. G(x) = ( x + 7 )^2

D. G(x) = ( 7x )^2

The answer is A. G(x) = 7x^2

Answer 2

If you were to vertically stretch the parent function of f(x)=x^2 by a factor of 7, you are basically stretching the the function up or vertically. Because you are stretching the function up, you are changing the y-value of the function which is the variable that shows the vertical axis of a graph, meaning to vertically stretch the function, you must perform 7y or 7(f(x)).

This would mean that your equation must be f(x)=7x^2.