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Question

Solve for xx12x+1+2x+1x1=2 where x12,1

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Solution

x12x+1+2x+1x1=2(x1)2+(2x+1)2=2(x1)(2x+1)x22x+1+4x2+4x+1=4x2+2x4x2x2+2x4=0x=2±4+42x=1±2

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