document.write( "Question 784576: Find all real solutions of the equation.\r
\n" ); document.write( "\n" ); document.write( " $\"+x%5E4-8x%5E2-9=0+\"$ \n" ); document.write( "

Algebra.Com's Answer #477289 by KMST(5328) $\"\"$ $\"About$

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Factoring,
\n" ); document.write( " $\"+x%5E4-8x%5E2-9=0+\"$ --> $\"%28x%5E2-9%29%28x%5E2%2B1%29=0+\"$ --> $\"%28x%2B3%29%28x-3%29%28x%5E2%2B1%29=0+\"$
\n" ); document.write( " $\"x%5E2%2B1=0\"$ has no real solutions, so we work from the other two factors
\n" ); document.write( " $\"x%2B3=0\"$ --> $\"highlight%28x=-3%29\"$
\n" ); document.write( " $\"x-3=0\"$ --> $\"highlight%28x=3%29\"$ \n" ); document.write( "

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