28.
Find the value of a, if x3 - ax2 + 6x - a is exactly divisible by (x + 2).
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1
Answer:
a=-4
Step-by-step explanation:
it is divided by x+2
x=-2
(-2)^3-a(-2)^2+6(-2)-a=0
-8-4a-12-a=0
-5a-20=0
-5a=20
a=-4
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