Question

Let f(x)=x^2−4x. Solve f(x)=−4.

Answer 1

( x + 2) ( x - 2 )

Explanation:

f(x) = x^2 -4x

-4 = x^2 - 4x

0 = x^2 - 4x + 4

0 = ( x + 2) ( x - 2 )

( x + 2) ( x - 2 )