Question

If f(x) = ax(x-3) and f(-2) = 5, what is the value of a?

Answer 1

a = 1/2

Explanation:

f(x) = ax(x-3) and f(-2) = 5

Replace x with -2 and f(x) with 5

5 = a (-2) (-2-3)

5 = a (-2)(-5)

5 = 10a

Divide each side by 10

5/10 = 10a/10

1/2 =a