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
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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
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