document.write( "Question 399581: I don't understand the steps that were taken to come up w/the answer. I also wrote out the exponent info in wording, being I could not figure out how to perform special characters on my computer.\r
\n" ); document.write( "\n" ); document.write( "3x(cube)-81y(cube) = 3(x-3y)(x(square)+3xy - 9y(square)
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Algebra.Com's Answer #282945 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
3x(cube)-81y(cube)
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\n" ); document.write( "3[x^3-27y^3]
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\n" ); document.write( "= 3[x^3-(3y)^3]
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\n" ); document.write( "= 3[x-(3y)][(x^2+3xy+9y^2]
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\n" ); document.write( "This is based on the form:
\n" ); document.write( "(a^3-b^3) = (a-b)(a^2+ab+b^2)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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