Question

Ƒ(x) = −4x² + 4x
Find f(-5)

Answer 1

To find Ƒ(-5), you can plug -5 in for x in the expression for Ƒ(x).

The expression for Ƒ(x) is Ƒ(x) = −4x² + 4x, so when x = -5, Ƒ(x) becomes Ƒ(-5) = −4(-5)² + 4(-5).

This simplifies to:

Ƒ(-5) = -4(25) + (-20)

Which is equal to:

Ƒ(-5) = -100 + (-20)

Which is equal to:

Ƒ(-5) = -120

So, Ƒ(-5) = -120.