a) (\sqrt{x}5
(√5 - √3)·(√5 - √3)·(√5 + √3) = (√25 - √15 - √15 + √9)·(√5 + √3) = √125 + √75 - √75 - √45 - √75 - √45 + √45 + √27 = √125 - √45 - √75 + √27 = 5√5 - 3√5 - 5√3 + 3√3 = 2√5 - 2√3
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(√5 - √3)·(√5 - √3)·(√5 + √3) = (√25 - √15 - √15 + √9)·(√5 + √3) = √125 + √75 - √75 - √45 - √75 - √45 + √45 + √27 = √125 - √45 - √75 + √27 = 5√5 - 3√5 - 5√3 + 3√3 = 2√5 - 2√3