Question

Let f(x)=4x2 + 5x
Evaluate f(-5)

Answer 1

f(- 5) = 75

Explanation:

Substitute x = - 5 into f(x) , that is

f(- 5) = 4(- 5)² + 5(- 5)

= 4(25) - 25

= 100 - 25

= 75