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Math Challenge II-A (AMC 10) Summer 2017 (Algebra) Homework Problem 1.27

 
 
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Re: Math Challenge II-A (AMC 10) Summer 2017 (Algebra) Homework Problem 1.27
by David Reynoso - Monday, June 12, 2017, 3:33 PM
 

Try adding and subtracting $ab$ to the expression. That should let you factor by grouping some of the terms.