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h(2²) + 5(2) - 12 = 0
4h + 10 - 12 = 0
4h = 2
h = 1/2
(1/2)x² + 5x - 12 = 0 (dikali2)
x² + 10x - 24 = 0
(x - 2)(x + 12) = 0
x = 2 atau 12 jadi akar yg satu 12