document.write( "Question 442758: 3a2(a – b) – 6a(a – b) + 21(a – b)Factor out the binomial
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3a2(a – b) – 6a(a – b) + 21(a – b)
\n" ); document.write( "immediately we can see that a-b can be factored out.
\n" ); document.write( "(a-b)*(3a^2-6a+21)
\n" ); document.write( "we can also factor out 3
\n" ); document.write( "3*(a-b)*(a^2-2a+7)
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