document.write( "Question 167092: (It don't have in textbook but teacher gives me worksheet)\r
\n" ); document.write( "\n" ); document.write( "Can you help me solve this problem:\r
\n" ); document.write( "\n" ); document.write( "June factored the polynomial c^9-d^12 into (c^3+d^4)(c^6-c^3*d^4+d^8).\r
\n" ); document.write( "\n" ); document.write( "Is she correct? How do u know?\r
\n" ); document.write( "\n" ); document.write( "MANY THANKS
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Algebra.Com's Answer #123074 by Earlsdon(6294)\"\" \"About 
You can put this solution on YOUR website!
June is not correct!
\n" ); document.write( "How do we know?
\n" ); document.write( "One way to prove this is to multiply the two factors, using FOIL, to see if you arrive at the given polynomial.
\n" ); document.write( " Simplifying.
\n" ); document.write( "\"c%5E9%2Bd%5E12\" and this is not the same as the given polynomial of \"c%5E9-d%5E12\"
\n" ); document.write( "Another way is to recognize the given polynomial as the difference of two cubes:
\n" ); document.write( "\"c%5E9-d%5E12+=+%28c%5E3%29%5E3+-+%28d%5E4%29%5E3\" and the difference of two cubes is factored thus:
\n" ); document.write( "\"A%5E3-B%5E3+=+%28A-B%29%28A%5E2%2BAB%2BB%5E2%29\" where: \"A+=+c%5E3\" and \"B+=+d%5E4\"
\n" ); document.write( "\"%28c%5E3%29%5E3+-+%28d%5E4%29%5E3+=+%28c%5E3-d%5E4%29%28c%5E6%2Bc%5E3%2Ad%5E4%2Bd%5E8%29\" and this is not what June got!
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