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Factor the difference of two squares. A^2-121

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2 Answers

The goal of this problem is to get it into the format:
 
(a2-b2)=(a+b)(a-b)
 
(a2-121)=(a2-112)=(a+11)(a-11)
 
If you expand that out, you can see that it is the start to your question.
Hi Hailey;
a2-121
(a)(a)=a2
(11)(11)=121
Therefore...
(a+11)(a-11)
Let's FOIL...
FIRST...(a)(a)=a2
OUTER...(a)(-11)=-11a
INNER...(11)(a)=11a
LAST...(11)(-11)=-121
a2-11a+11a-121
a2-121