document.write( "Question 705145: Find all solutions, real and complex, of the equation. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.)
\n" ); document.write( "x4 − 9x2 + 20 = 0 \n" ); document.write( "

Algebra.Com's Answer #434447 by josgarithmetic(39617) $\"\"$ $\"About$

You can put this solution on YOUR website!
It's factorable so that makes the solution simpler to do.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "You are probably trying to show $\"x%5E4-9x%5E2%2B20=0\"$ . First part is to treat x^2 as the main variable. Factoring gives us:
\n" ); document.write( " $\"%28x%5E2-4%29%2A%28x%5E2-5%29=0\"$ .
\n" ); document.write( "Still not done.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The first binomial factor, to be zero, requires x=-2 or x=+2. \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The second binomial would factor to $\"%28x-sqrt%285%29%29%2A%28x%2Bsqrt%285%29%29\"$ , so for this to be zero, $\"x=%2Bsqrt%285%29\"$ or $\"x=-sqrt%285%29\"$ .\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Solution list: $\"-2\"$ , $\"-sqrt%285%29\"$ , $\"%2B2\"$ , $\"%2Bsqrt%285%29\"$ . \n" ); document.write( "

\n" );