Question

P(x)=3x^3+2x^2 -8x+7 evaluate when x=-2

Answer 1

p(- 2) = 7

Explanation:

p(x) = 3x³ + 2x² - 8x + 7 ← substitute x = 2 into p(x)

p(- 2) = 3(- 2)³ + 2(- 2)² - 8(- 2) + 7

= 3(- 8) + 2(4) + 16 + 7

= - 24 + 8 + 23

= - 16 + 23

= 7