document.write( "Question 202157: Solve 2x^-2-x^-1-1=0 \n" ); document.write( "

Algebra.Com's Answer #152433 by RAY100(1637) $\"\"$ $\"About$

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2 x^-2 -x^-1 -1 =0
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\n" ); document.write( "2/x^2 -1/x^1 -1 =0
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\n" ); document.write( "multiply thru by x^2
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\n" ); document.write( "2 -x -x^2 =0
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\n" ); document.write( "mult thru by -1
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\n" ); document.write( "x^2 +x -2 =0
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\n" ); document.write( "(x+2)(x-1) =0
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\n" ); document.write( "x= 1, -2
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\n" ); document.write( "check
\n" ); document.write( "(1) 2*1^-2 - (1)^-1 -1 =0
\n" ); document.write( "2 -1-1=0,,,,,ok
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\n" ); document.write( "(-2),,,,2*(-2)^-2 -(-2)^-1 -1 =0
\n" ); document.write( ".5 +.5 -1 =0,,,,,,,,,ok
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