Answers

2016-06-16T21:49:27+08:00
(that is a factoring) you'll solve that as variable to variable and when the sign is different that is negative, therefore that is a²- b² 
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  • Brainly User
2016-06-16T23:51:20+08:00
(a - b) (a + b) = a² - b²
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