Question

F(x)=4x^(2)+x-5

Find f(−5)

Answer 1

90

Explanation:

4(-5)² + (-5) + (-5)

4(25) - 10

100 - 10 = 90

Answer 2

`f(-5)=90`

Explanation:

We are given the function:

`f(x)=4x^2+x-5`

In order to find f(-5), substitute -5 for x:

`f(-5)=4(-5)^2+(-5)-5`

Evaluate:

`f(-5)=4(25)-10=100-10=90`

Therefore:

`f(-5)=90`