document.write( "Question 887314: Solve the equation by making an appropriate substitution. (Don't forget imaginary solutions)
\n" ); document.write( "x(exponent 4) + 2x(exponent 2) -8 =0 \n" ); document.write( "

Algebra.Com's Answer #536515 by josgarithmetic(39617) $\"\"$ $\"About$

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$\"x%5E4%2B2x%5E2-8=0\"$
\n" ); document.write( "Use $\"x%5E2\"$ as if it were the variable. (or use a substitution for $\"x%5E2\"$ ).
\n" ); document.write( " $\"%28x%5E2-2%29%28x%5E2%2B4%29=0\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Either $\"x%5E2-2=0\"$ , which gives $\"highlight%28x=0%2B-+sqrt%282%29%29\"$
\n" ); document.write( "OR
\n" ); document.write( " $\"x%5E2%2B4=0\"$ , which will give $\"x%5E2=-4\"$ , $\"x=0%2B-+sqrt%28-4%29\"$ , meaning $\"highlight%28x=0%2B-+2i%29\"$ \n" ); document.write( "

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