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

 
 
Picture of Lawrence Zhang
Math Challenge II-A (AMC 10) Summer 2017 (Algebra) Homework Problem 1.27
by Lawrence Zhang - Sunday, June 11, 2017, 10:03 PM
 

Hello Mr. John:

I have some trouble factoring 1.27. May I have a hint?

(As a side comment, was the word "factor" left out incidentally on the problem?)

                                                                                                                           Thanks, Lawrence

 
Picture of David Reynoso
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.