Question

find the value of m if x+4 is a factor of the polynomial x^3 +xm

Answer 1

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X+4= 0
X= -4

P(x) = x³+xm
P(-4) = (-4)³+ -4×m
= -64+ -4m
64= -4m
64/-4 = m
-16= m

Therefore m is -16

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