document.write( "Question 969850: Solve by completing the square. x^2-6x-4=0 \n" ); document.write( "

Algebra.Com's Answer #592576 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+x%5E2++-+6x+-+4+=+0+\"$
\n" ); document.write( "Add $\"+4+\"$ to both sides
\n" ); document.write( " $\"+x%5E2++-+6x+=+4+\"$
\n" ); document.write( "Take $\"+1%2F2+\"$ of the coefficient of The
\n" ); document.write( " $\"+x+\"$ term, square it, and add it to both sides
\n" ); document.write( "----------------------------
\n" ); document.write( " $\"+x%5E2+-+6x+%2B+%28+-6%2F2+%29%5E2+=+4+%2B+%28+-6%2F2+%29%5E2+\"$
\n" ); document.write( " $\"+x%5E2+-+6x+%2B+9+=+4+%2B+9+\"$
\n" ); document.write( " $\"+x%5E2+-+6x+%2B+9+=+13+\"$
\n" ); document.write( " $\"+%28+x+-+3+%29%5E2+=+13+\"$
\n" ); document.write( "Take the square root of both sides
\n" ); document.write( " $\"+x+-+3+=+sqrt%2813%29+\"$
\n" ); document.write( " $\"+x+=+3+%2B+sqrt%2813%29+\"$
\n" ); document.write( "And also, taking the negative square root,
\n" ); document.write( " $\"+x+=+3+-+sqrt%2813%29+\"$
\n" ); document.write( "---------------------
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+x%5E2++-+6x+-+4+=+0+\"$
\n" ); document.write( " $\"+%28+3+-+sqrt%2813%29+%29%5E2+-+6%2A%28+3+-+sqrt%2813%29+%29++-+4+=+0+\"$
\n" ); document.write( " $\"+9+-+6%2Asqrt%2813%29+%2B+13+-+18+%2B+6%2Asqrt%2813%29+-+4+=+0+\"$
\n" ); document.write( " $\"+9+%2B+13+-+18+-+4+=+0+\"$
\n" ); document.write( " $\"+22+-+22+=+0+\"$
\n" ); document.write( "OK
\n" ); document.write( "You can check $\"+x+=+3+%2B+sqrt%2813%29+\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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