(√a + 3√b)/(a-b) - 2/(√a+√b)
Note that (√a-√b)(√a+√b) = a-b, so
(√a + 3√b)/(a-b) - 2/(√a+√b) * (√a-√b)/(√a-√b)
(√a+3√b)/(a-b) - 2(√a-√b)/(a-b)
(√a+3√b-2√a+2√b)/(a-b)
(-√a+5√b)/(a-b)
(square root of a + 3 square root of b /a - b) - (2/square root of a + square root of b).
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