document.write( "Question 312417: Factor trinomial \r
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Algebra.Com's Answer #223314 by mananth(16946)\"\" \"About 
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c^2-10c+21
\n" ); document.write( "c^2 -7c-3x+21
\n" ); document.write( "c(c-7)-3(c-7)
\n" ); document.write( "(c-3)(c-7)
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