document.write( "Question 1092668: Difference of Squares
\n" ); document.write( "9m^2-1
\n" ); document.write( "I know the answer is (3m^2-1)(3m+1). A friend helped me come to the conclusion. She was unable to explain to me how I would get there. I am trying to learn this for the rest of my class. I don't grasp it and my text doesn't explain it. \n" ); document.write( "

Algebra.Com's Answer #707311 by ikleyn(52787) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "The square of the sum formula is                  $\"%28a+%2B+b%29%5E2+=+a%5E2+%2B+2ab+%2Bb%5E2\"$ .\r
\n" ); document.write( "\n" ); document.write( "      For details and examples of applications of this formula see the lesson The square of the sum formula in this site.\r
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\n" ); document.write( "\n" ); document.write( "The square of the difference formula is      $\"%28a+-+b%29%5E2+=+a%5E2+-+2ab+%2Bb%5E2\"$ .\r
\n" ); document.write( "\n" ); document.write( "      For details and examples of applications of this formula see the lesson The square of the difference formula in this site.\r
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\n" ); document.write( "\n" ); document.write( "The difference of squares formula is        $\"a%5E2+-+b%5E2+=+%28a+%2B+b%29%2A%28a-+b%29\"$ .\r
\n" ); document.write( "\n" ); document.write( "      For details and examples of applications of this formula see the lesson The difference of squares formula in this site.\r
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\n" ); document.write( "\n" ); document.write( "By the way, your answer is incorrect.\r
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