document.write( "Question 305371: x^4-4x^2+3=0 \n" ); document.write( "

Algebra.Com's Answer #218694 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"u=x%5E2\"$ , then $\"u%5E2=x%5E4\"$
\n" ); document.write( " $\"x%5E4-4x%5E2-3=u%5E2-4u%2B3=0\"$
\n" ); document.write( "Factor
\n" ); document.write( " $\"%28u-1%29%28u-3%29=0\"$
\n" ); document.write( "Two u solutions:
\n" ); document.write( " $\"u-1=0\"$
\n" ); document.write( " $\"u=1\"$
\n" ); document.write( " $\"x%5E2=1\"$
\n" ); document.write( " $\"x=1\"$ and $\"x=-1\"$
\n" ); document.write( ".
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\n" ); document.write( ".
\n" ); document.write( " $\"u-3=0\"$
\n" ); document.write( " $\"u=3\"$
\n" ); document.write( " $\"x%5E2=3\"$
\n" ); document.write( " $\"x=sqrt%283%29\"$ and $\"x=-sqrt%283%29\"$
\n" ); document.write( "Four x solutions:
\n" ); document.write( "( $\"-sqrt%283%29\"$ , $\"-1\"$ , $\"1\"$ , $\"sqrt%283%29\"$ ) \n" ); document.write( "

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