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Question
Simplify by using formula :
(a + b - c) (a - b + c)
Solution
(a + b - c) (a - b + c)
= (a + b - c) [a - (b - c)]
= (a)2 - (b - c)2
(using identity : (a + b) (a - b) = a2 - b2)
= a2 - (b2 + c2 - 2bc)
= a2 - b2 - c2 + 2bc.
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