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17) √(4 1/2) = √(9/2) = √9/√2 = 3/√2 . √2/√2 = 3√2 / 2 = (3/2) √2
18) 14/(√2 + 3) = 14/(√2 + 3) x (√2 - 3)/(√2 - 3)
= 14(√2 - 3)/(2 - 9) = 14(√2 - 3)/-7 = -2(√2 - 3) = -2√2 + 6 = 6 - 2√2