Question

Evaluate the function.
f(x) = -4x^2+9Find f(-3)

Answer 1

-27

Explanation:

1. f(x) = -4x² + 9
2. f(-3) = -4(-3)² + 9
3. f(-3) = -4(9) + 9
4. f(-3) = -36 + 9
5. f(-3) = -27

Answer 2

`f(-3)=-27`

Explanation:

So we have the function:

`f(x)=-4x^2+9`

And we want to find f(-3).

So, let's substitute -3 for x. Therefore:

`f(-3)=-4(-3)^2+9`

Square:

`f(-3)=-4(9)+9`

Multiply:

`f(-3)=-36+9`

Add:

`f(-3)=-27`

And we're done!