Question

Find p(2) + p(-1) for the following polynomial.
p(x) = x3 + 3x2 - 2x + 4​

Answer 1

Answer:

28

Step-by-step explanation:

p ( x ) = x^3 + 3x^2 - 2x + 4

p ( 2 )

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

= 8 + 3 ( 4 ) - 4 + 4

= 8 + 12 + 0

= 20

p ( - 1 )

= ( - 1 )^3 + 3 ( - 1 )^2 - 2 ( - 1 ) + 4

= - 1 + 3 ( 1 ) + 2 + 4

= - 1 + 3 + 6

= 2 + 6

= 8

p ( 2 ) + p ( - 1 )

= 20 + 8

= 28