Question

Evaluate the polynomial f(x) =2x^3-4x^2+2x-8. At x=-2

Answer 1

-44

Explanation:

If f(x) =2x^3-4x^2+2x-8 where x=-2

You replace all of the "x's" for -2s. Like so..

2(-2)^3-4(-2)^2+2(-2)-8

it would = -44.

Answer 2

f(- 2) = - 44

Explanation:

Substitute x = - 2 into f(x) and evaluate, that is

f(- 2) = 2(- 2)³ - 4(- 2)² + 2(- 2) - 8

= 2(- 8) - 4(4) - 4 - 8

= - 16 - 16 - 4 - 8

= - 44