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jadi a + b = 9 - 4 = 5
1/2 + 1/√5 (√5 + 2)/2√5
= (√5 - 2)(√5 - 2)
(√5 + 2)(√5 - 2)
= 5 + 4 - 4√5
5 - 4
a - b√5 = 9 - 4√5 berarti a = 9 dan b = 4 b, maka a + b = 9 + 4 = 13