The product of a and b added to the difference of a and b (a > b)
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a + b) (a – b) = a(a – b) + b (a – b)
= a2 – ab + ba + b2
= a2 – b2
Therefore (a + b) (a – b) = a2 – b2
(First term + Second term) (First term – Second term) = (First term)2 – (Second term) 2
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