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Show that (X +2)is a factor of x³-4x²-2x+20 |
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Answer» Here , x+2 =0 then x=-2 Let's put f(x) =-2 in given equation x³-4x²-2x+20 = f(-3)= (-2)³-4*(-2)² -2*(-2) +20 -8-16+4+20 -24+24 =0 hence ,x+2 is a factor of given polynomial f(x). Thank you
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