Question

Evaluate the expression for the given value of the variuble with step by step explanation

Answer 1

Substitute the value of b = -2 to the expression

$-4b-8+(-1)-b^2+2b^3=2b^3-b^2-4b-8-1=2b^3-b^2-4b-9\\\\2(-2)^3-(-2)^2-4(-2)-9=2(-8)-4+8-9=-16-4+8-9=-21$