Question

steps of p(x)=(x+1)(x-2),x=-1,2

Answer 1

P(-1) = (-1+1)(-1-2)
=-1(-1-2)+1(-1-2)
=+1+2-1-2
=0



P(2)=(2+1)(2-2)
=2(2-2)+1(2-2)
=4-4+2-2
=0