Question

verify that -1 is a zero of x3-2x2-x+2 also find all the zeroes​

Answer 1

p(x)= (-1)³-2(-1)²-(-1)+2

= -1-2+1+2

= -3+3=0

-1 is a zero of polynomial.

x³-2x²-x+2

=x³-x-2x²+2

= x(x²-1)-2(x²-1)

=(x²-1)(x-1)

= (x-1)(x+1)(x-1)