Question

F (x) = -x² + 6x - 18


Find f (-3)

Answer 1

Explanation:

`f(x) = - {x}^(2) + 6x - 18 \\ f( - 3) = - {( - 3)}^(2) + 6( - 3) - 18 \\ = - 9 - 18 - 18 \\ = - 45`

-45 is the right answer.

Answer 2

• -45

Explanation:

Given

• f (x) = -x² + 6x - 18

To find f (-3) substitute x with -3

• f(-3) = -(-3)² + 6(-3) - 18 = - 9 - 18 - 18 = -45
• f(-3) = -45