document.write( "Question 834332: solve the following by completing the square\r
\n" ); document.write( "\n" ); document.write( "7x(squared)-7x-1=0 \n" ); document.write( "

Algebra.Com's Answer #502937 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+7x%5E2+-+7x+-++1+=+0+\"$
\n" ); document.write( " $\"+7x%5E2+-+7x+=+1+\"$
\n" ); document.write( " $\"+x%5E2+-+x+=+1%2F7+\"$
\n" ); document.write( " $\"+x%5E2+-+x+%2B+%28-1%2F2%29%5E2+=+1%2F7+%2B+%28-1%2F2%29%5E2+\"$
\n" ); document.write( " $\"+x%5E2+-+x+%2B+1%2F4+=+1%2F7+%2B+1%2F4+\"$
\n" ); document.write( " $\"+x%5E2+-+x+%2B+1%2F4+=+4%2F28+%2B+7%2F28+\"$
\n" ); document.write( " $\"+%28+x+-+1%2F2+%29%5E2+=+11%2F28+\"$
\n" ); document.write( " $\"+x+-+1%2F2+=+sqrt%28+11%2F28+%29+\"$
\n" ); document.write( " $\"+x+=+1%2F2+%2B+sqrt%28+11%2F28+%29+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+x+=+1%2F2+-+sqrt%28+11%2F28+%29+\"$
\n" ); document.write( "---------------------------
\n" ); document.write( "Just to make it a lot easier, I'll check
\n" ); document.write( "by converting to decimals
\n" ); document.write( " $\"+x+=+.5+%2B+.62678+\"$
\n" ); document.write( " $\"+x+=+1.12678+\"$
\n" ); document.write( " $\"+7x%5E2+-+7x+-++1+=+0+\"$
\n" ); document.write( " $\"+7%28+1.12678+%29%5E2+-+7%2A1.12678+-++1+=+0+\"$
\n" ); document.write( " $\"+8.8874+-+7.8875+-+1+=+0+\"$
\n" ); document.write( " $\"+-.0001+=+0+\"$
\n" ); document.write( "error due to rounding off -OK
\n" ); document.write( " \n" ); document.write( "

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