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Question
Use a suitable identity to get the following products.
(− a + c) (− a + c)
Solution
(− a + c) (− a + c) = (− a + c)2
= (− a)2 + 2(− a) (c) + (c)2 [(a + b)2 = a2 + 2ab + b2]
= a2 − 2ac + c2
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