document.write( "Question 255505: (x^9+x^8)(x^9+x^8-x^7) \n" ); document.write( "

Algebra.Com's Answer #187744 by richwmiller(17219) $\"\"$ $\"About$

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multiply x^9 by the three terms
\n" ); document.write( "x^9*x^9+x^9*x^8-x^9*x^7
\n" ); document.write( "multiply x^8 by the three terms
\n" ); document.write( "x^8*x^9+x^8*x^8-x^*8*x^7\r
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\n" ); document.write( "\n" ); document.write( "x^9*x^9+x^9*x^8-x^9*x^7+x^8*x^9+x^8*x^8-x^*8*x^7
\n" ); document.write( "now combine like terms
\n" ); document.write( "x^18+x^17-x^16+x^17+x^16-x^15
\n" ); document.write( "x^18+2x^17-x^15 or
\n" ); document.write( "factored x^15(x^3+2x^2-1)
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