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Question

If mx+n(x−a)(x+b)=ma+n(a+b)(x−a)+k, then value of k will be:

A
mb+n(a+b)(x+b)
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B
mbn(ab)(x+b)
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C
mb+n(a+b)(x+b)
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D
mbn(a+b)(x+b)
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Solution

The correct option is D mbn(a+b)(x+b)
LHS =mx+n(xa)(x+b); RHS =ma+n(a+b)(xa)+k
LHS RHS = k
mx+n(xa)(x+b)ma+n(a+b)(xa)=k
1xa[(a+b)[mx+n](ma+n)(x+b)(x+b)(a+b)]=k
1(xa)[mbn](xa)(x+b)(a+b)=k
k=mbn(x+b)(a+b)

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