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4x² - 9 = 0
(2x+3)(2x-3) = 0
Menghasilkan 2 solusi:
Solusi 1:
2x + 3 = 0
2x = -3
x = -3/2
Solusi 2:
2x - 3 = 0
2x = 3
x = 3/2
Sehingga,
HP = {x | -3/2, 3/2}