Question

Verify whether x = −1, 2 is zero of the polynomial p(x) = (x + 1)(x − 2)

please very urgent

Answer 1

p(-1)=(-1+1)(-1-2)=0×-3=0 so -1 is a root

p(2)=(2+1)(2-2)=3×0=0 so 2 is also a root

so we conclude that both -1 and 2 are roots