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

Question

Frances Morgan

Mathematics

15 April, 06:40

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

+4

Answers (2)

Know the Answer?

Savanah · Answer 1

-44

Step-by-step 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.

Jimmy Wall · Answer 2

f ( - 2) = - 44

Step-by-step 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