Question

If you horizontally stretch the quadratic parent function f(x)=x^2 by a factor of 3. What is the equation

Answer 1

A factor of 3 represents a horizontal stretch of f(x) to the left.

Why left?

Positive factors move the parent function to the left on the xy-plane and negative factors move the parent function to the right on the xy-plane.

So, 3 times f(x) = 3x^2.

The needed equation is f(x) = 3x^2.