### Home > A2C > Chapter 9 > Lesson 9.1.3 > Problem 9-56

9-56.

What is the stretch factor (the value of *a*) for the equation of the graph in part (c) of problem 9-47? Write the exact equation of the function. Homework Help ✎

Using the equation that you found before, what value of *y* did you get for *x* = 0?

What do you need to multiply that by to get the appropriate value?

The stretch factor is 2.

The equation is *y* = −2(*x* + 2)^{2}(*x* − 1).