Question

(√a + √b) (√a - √b) =_
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Answer 1

Answer:

(√a+√b) (√a-√b) = a-b

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Answer 2

$(a + b)(a - b) = {a}^{2} - {b}^{2} \\ so \: ( \sqrt{a} + \sqrt{b} )(\sqrt{a} + \sqrt{b} ) = \\ a - b$