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x^2 - 4 = 3x
x^2 - 3x - 4 = 0
misal dari diskriminannya
D = b^2 - 4ac = (-3)^2 - 4(1)(-4) = 25
L = (D√D)/(6a^2) = (25√25)/(6.1^2)
L = 125/6 satuan luas
atau dg intgral standar (x - 4)(x + 1)
dari x = -1 sampai x = 4