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Question

Find the value of m in order that x42x3+3x2mx+5 may be exactly divisible by x3.

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Solution

Let , p(x)=x42x3+3x2mx+5
If (x3) exactly divides p(x), then for x=3, p(x)=0
i.e. p(3)=0
342×33+3×323m+5=0
8154+273m+5=0
3m+59=0
m=593

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