document.write( "Question 204502: $\"x%5E2%2B8x-1=0\"$ \n" ); document.write( "

Algebra.Com's Answer #154375 by alicealc(293) $\"\"$ $\"About$

You can put this solution on YOUR website!
because it can't be factorized, we can use this formula:\r
\n" ); document.write( "\n" ); document.write( " $\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=+%28-8+%2B-+sqrt%288%5E2-4%2A1%2A%28-1%29%29%29%2F%282%2A1%29+\"$
\n" ); document.write( " $\"x+=+%28-8+%2B-+sqrt%2816%2B4%29%29%2F%282%29\"$
\n" ); document.write( " $\"x+=+%28-8+%2B-+sqrt%2820%29%29%2F%282%29\"$
\n" ); document.write( " $\"x+=+%28-8+%2B-+sqrt%284%2A5%29%29%2F%282%29\"$
\n" ); document.write( " $\"x+=+%28-8+%2B-+2%2Asqrt%285%29%29%2F%282%29+\"$
\n" ); document.write( " $\"x+=+%28-4+%2B-+sqrt%285%29%29\"$ \r
\n" ); document.write( "\n" ); document.write( "so,
\n" ); document.write( "x1 = $\"-4+%2B+sqrt%285%29\"$
\n" ); document.write( "x2 = $\"-4+-+sqrt%285%29\"$ \r
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