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kalikan sekawan untuk ruas kiri
2-√5 / 2+√5 * 2-√5 / 2-√5
(=) (2-√5)(2-√5) / (2+√5)(2-√5)
(=) 4 -4√5 + 5 / 4 - 5
(=) 9 - 4√5 / -1
(=) -(9-4√5)
(=) -9 + 4√5
-9 + 4√5 = a + b√5
a = -9
b = 4
a + b = -9 + 4
(=) -5