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4x² = 25
x² = 25/4
x =
(+-) itu artinya plus minus
b. x/3 + 3/x = 0 (semua dikali 3x)
x² + 9 = 0
x² = -9
x = (+-) √9
tapi yg memenuhi hanya √9 = 3, karena √-9 disebut bilangan imajiner