Question

18. (x + 1) is a factor of the polynomial
(a) x3 – 2x²+x+2
(c) x3+ 2x² – x-2
(b) x3 + 2x² + x-2
(d) x3+ 2x² - x+2​

Answer 1

Answer:

x=-1

a)(-1)³-2(-1)²-1+2

=-1-2-1+2

=-2

c)(-1)³+2(-1)²-(-1)-2

=-1+2+1-2

=0

b)(-1)³+2(-1)²-1-2

=-1+2-1-2

=-2

d)(-1)³+2(-1)²-(-1)+2

=-1+2+1+2

=4

therefore 'c' is the factor of polynomial