document.write( "Question 1000969: [SQRT(2x2 - 1)]=x \n" ); document.write( "

Algebra.Com's Answer #618279 by fractalier(6550) $\"\"$ $\"About$

You can put this solution on YOUR website!
From
\n" ); document.write( " $\"sqrt%282x%5E2+-+1%29=x\"$
\n" ); document.write( "we square both sides and get
\n" ); document.write( " $\"2x%5E2+-+1+=+x%5E2\"$
\n" ); document.write( " $\"x%5E2+=+1\"$
\n" ); document.write( " $\"x=1\"$ and $\"x=-1\"$
\n" ); document.write( "but the second solution does not check out... \n" ); document.write( "

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