Question

If P (x) =x³-x² +x+3 find the value of P(-1) +P(1) /2

Answer 1

p(x)=x3 _x2+x+3

p(-1)=(-1)3_(-1)2+(-1)+3

=-1-1-1+3

=0

p(1/2)=(1/2)3-(1/2)2+(1/2)+3

=1/8-1/4+1/2+3

=27/8

=p(-1)+p(1/2)

=0+27/8

=27/8