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y = x² - 1
----------------------- (-)
0 = -2x² + 4x + 6
2x² - 4x - 6 = 0
nilai diskriminan (D) = (-4)² - 4(2)(-6) = 16 + 48 = 64
jadi, luas daerahnya adalah :
L = D√D/(6a²) = 64√64/(6(2)²) = 64(8)/24 = 64/3 satuan luas