document.write( "Question 53463: factor out 4xsquared + 9 \n" ); document.write( "

Algebra.Com's Answer #35739 by Earlsdon(6294) $\"\"$ $\"About$

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Factor:
\n" ); document.write( " $\"4x%5E2%2B9\"$ This is a sum of two squares:
\n" ); document.write( " $\"%282x%29%5E2+%2B+%283%29%5E2\"$
\n" ); document.write( "The sum of two squares factors as:
\n" ); document.write( " $\"a%5E2%2Bb%5E2+=+%28a%2Bbi%29%28a-bi%29\"$ , so:
\n" ); document.write( " $\"4x%5E2%2B9+=+%282x%2B3i%29%282x-3i%29\"$ where: $\"i+=+sqrt%28-1%29\"$
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