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Question

If 1(1−2x)(1+3x) =A1−2x+B1+3x then 2B=

A
A
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B
2A
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C
3A
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D
-3A
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Solution

The correct option is D 3A
LHS=1(12x)(1+3x);RHS=A(12x)+B(1+3x)

=A(1+3x)+B(12x)(12x)(1+3x)

LHS=RHS

1=A(1+3x)+B(12x)

keep x=1/2 we get A=2/5 (from eqn (1))

keep x=1/3 we get B=3/5 (from eqn (1))

2B=6/5=3×2/5=3×A

2B=3A

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