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Question

If x is a solution of the equation 2x+12x1=1, (x12), then 4x21 is eaual to :

A
2
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B
34
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C
22
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D
12
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Solution

The correct option is B 34
2x+1=1+2x1Squaring both the sides,2x+1=1+2x1+22x11=22x1Squaring both the sides,1=4(2x1)x=584x21=4(58)21=34

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