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Question

If 5x+1(x+2)(x−1)=Ax+2+Bx−1, then 3B is equal to

A
A
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B
2A
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C
3A
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D
4A
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Solution

The correct option is B 2A
Given, 5x+1(x+2)(x1)=Ax+2+Bx1
Making denominators same on both sides of the equation,
5x+1=A(x1)+B(x+2) .....[As numerators are equal]
Putting x=1, we get B=2
and on putting x=2, we get A=3
Hence, 3B=6=2A

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