document.write( "Question 947605: How would I use the quadratic formula to solve for x^2-9x+18=0? \n" ); document.write( "

Algebra.Com's Answer #578245 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+x%5E2++-+9x+%2B+18+=+0+\"$
\n" ); document.write( " $\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( " $\"+a+=+1+\"$
\n" ); document.write( " $\"+b+=+-9+\"$
\n" ); document.write( " $\"+c+=+18+\"$
\n" ); document.write( "------------
\n" ); document.write( " $\"x+=+%28-%28-9%29+%2B-+sqrt%28+%28-9%29%5E2+-+4%2A1%2A18+%29%29%2F%282%2A1%29+\"$
\n" ); document.write( " $\"x+=+%28+9+%2B-+sqrt%28+81+-+72+%29%29%2F2+\"$
\n" ); document.write( " $\"+x+=+%28+9+%2B-+sqrt%28+9+%29+%29+%2F+2+\"$
\n" ); document.write( " $\"+x+=+%28+9+%2B+3+%29+%2F+2+\"$
\n" ); document.write( " $\"+x+=+12%2F2+\"$
\n" ); document.write( " $\"+x+=+6+\"$
\n" ); document.write( "And, using the negative square root,
\n" ); document.write( " $\"+x+=+%28+9+-+3+%29+%2F+2+\"$
\n" ); document.write( " $\"+x+=+6%2F2+\"$
\n" ); document.write( " $\"+x+=+3+\"$
\n" ); document.write( "---------------
\n" ); document.write( "check:
\n" ); document.write( "The factors are:
\n" ); document.write( " $\"+%28+x+-+6+%29%2A%28+x+-+3+%29+=+x%5E2+-+9x+%2B+18+\"$
\n" ); document.write( "OK \n" ); document.write( "

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