document.write( "Question 897438: x^2+5x+8=0 solve in complex number system \n" ); document.write( "

Algebra.Com's Answer #544143 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"x%5E2%2B5x%2B8=0\"$
\n" ); document.write( "Complete the square.
\n" ); document.write( " $\"x%5E2%2B5x%2B%285%2F2%29%5E2%2B8=%285%2F2%29%5E2\"$
\n" ); document.write( " $\"%28x%2B5%2F2%29%5E2%2B8=25%2F4\"$
\n" ); document.write( " $\"%28x%2B5%2F2%29%5E2=25%2F4-32%2F4\"$
\n" ); document.write( " $\"%28x%2B5%2F2%29%5E2=-7%2F4\"$
\n" ); document.write( " $\"x%2B5%2F2=0+%2B-+%28sqrt%287%29%2F2%29i\"$
\n" ); document.write( " $\"x=-%285%2F2%29+%2B-+%28sqrt%287%29%2F2%29i\"$ \n" ); document.write( "

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