document.write( "Question 320415: (5x+2u-5)(4x-5u+3) \n" ); document.write( "
Algebra.Com's Answer #229476 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
Use a substitution,
\n" ); document.write( "\"A=2u-5\"
\n" ); document.write( "\"B=-5u%2B3\"
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\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=%285x%2BA%29%284x%2BB%29\"
\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=20x%5E2%2B5Bx%2B4Ax%2BAB\"
\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=20x%5E2%2B%285B%2B4A%29x%2BAB\"
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\n" ); document.write( "\"5B%2B4A=5%28-5u%2B3%29%2B4%282u-5%29\"
\n" ); document.write( "\"5B%2B4A=-25u%2B15%2B8u-20\"
\n" ); document.write( "\"5B%2B4A=-17u-5\"
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\n" ); document.write( "\"AB=%282u-5%29%28-5u%2B3%29\"
\n" ); document.write( "\"AB=-10u%5E2%2B6u%2B25u-15\"
\n" ); document.write( "\"AB=-10u%5E2%2B31u-15\"
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\n" ); document.write( "Substituting,
\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=20x%5E2%2B%285B%2B4A%29x%2BAB\"
\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=20x%5E2%2B%28-17u-5%29x-10u%5E2%2B31u-15\"
\n" ); document.write( "\"%285x%2B2u-5%29%284x-5u%2B3%29=highlight%2820x%5E2-%2817u%2B5%29x-10u%5E2%2B31u-15%29\"
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