Question

(a - b)(a - b) – (a + b) (a - b) is equal to :
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Answer 1

(a-b)^2-a^2-b^2

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Answer 2

Answer:

(a - b)(a - b) – (a + b)(a - b) = (a - b)² - (a²-b²)

                                          = a² + b² -2ab - a² + b²

                                          = 2b² - 2 ab = 2b(b - a)

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