Question 202157
2 x^-2  -x^-1  -1  =0
.
2/x^2 -1/x^1 -1 =0
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multiply  thru  by  x^2
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2 -x -x^2 =0
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mult  thru  by  -1
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x^2 +x -2 =0
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(x+2)(x-1) =0
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x= 1, -2
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check
(1) 2*1^-2  - (1)^-1 -1 =0
2 -1-1=0,,,,,ok
.
(-2),,,,2*(-2)^-2 -(-2)^-1  -1 =0
.5 +.5 -1 =0,,,,,,,,,ok