document.write( "Question 357892: Find all the complex solutions of:\r
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\n" ); document.write( "x^4+3x^2-4=0 \n" ); document.write( "

Algebra.Com's Answer #255466 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"x%5E4%2B3x%5E2-4=0\"$
\n" ); document.write( "Use a substitution,
\n" ); document.write( " $\"u=x%5E2\"$
\n" ); document.write( " $\"u%5E2=x%5E4\"$
\n" ); document.write( " $\"u%5E2%2B3u-4=0\"$
\n" ); document.write( " $\"%28u%2B4%29%28u-1%29=0\"$
\n" ); document.write( " $\"u%2B4=0\"$
\n" ); document.write( " $\"x%5E2%2B4=0\"$
\n" ); document.write( " $\"x%5E2=-4\"$
\n" ); document.write( " $\"highlight%28x=0+%2B-+2i%29\"$
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\n" ); document.write( " $\"u-1=0\"$
\n" ); document.write( " $\"x%5E2=1\"$
\n" ); document.write( " $\"highlight%28x=0+%2B-+1%29\"$
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