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= √(16 + 2√55))
= √11 + √5
b) √(14 - 6√5)
= √(14 - 2√(9 x 5))
= √(14 - 2√45)
= √9 - √5
= 3 - √5
ingat:
√[(a + b) + 2√ab) = √a + √b dengan a > b