document.write( "Question 935045: If x is a whole number and 437 = (21 + x)(21 - x), then x = \n" ); document.write( "

Algebra.Com's Answer #568150 by MathLover1(20849) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( " $\"437+=+%2821+%2B+x%29%2821+-x%29\"$ , \r
\n" ); document.write( "\n" ); document.write( " $\"437+=+21%5E2+-x%5E2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"437+=+441+-x%5E2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2+=+441+-437\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2+=+4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=+sqrt%284%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=+2\"$ or $\"x+=+-2\"$ \n" ); document.write( "

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