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det = (a+b)b - a^2 = 0
ab + b^2 = a^2
b^2 + ab = a^2 (jadikan kuadrat sempurna)
b^2 +ab + (1/2a)^2 = a^2 + (1/2a)^2
b^2 + ab + 1/4 a^2 = a^2 + 1/4 a^2
(b + 1/2 a)^2 = 5/4 a^2
b + 1/2 a = 1/2 a √5
b = (1/2)a √5 - 1/2a
Jadi nilai b = (1/2)a √5 - 1/2 a = 1/2 a(√5 - 1)