Question

Exercise: Given
ƒ(x) = x² − 4x + 9.
Find f(-2). Simplify the answer.

Answer 1

Answer: 21

Work Shown

`f(\text{x}) = \text{x}^2 - 4\text{x}+9\\\\f(-2) = (-2)^2 - 4(-2) + 9\\\\f(-2) = 4 - 4(-2) + 9\\\\f(-2) = 4 + 8 + 9\\\\f(-2) = 12 + 9\\\\f(-2) = 21\\\\`

Desmos can be used to verify the answer is correct. GeoGebra is another option.