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D=b kuadrat - 4 a c
D=0 kuadrat - 4.1.-4
=0+16=16
L=16√16 / 6.1 kuadrat
=16.4 / 6= 32/3
Luas daerah =
= 1/2 × x² - ((1/3 × x³) - (4 × x)) dengan batas -2 sampai 2
= 1/2 × (2)² - ((1/3 × (2)³) - (4 × 2)) - (1/2 × (-2)²-((1/3 × (-2)³) - (4 ×(-2)))
= (1/2 × 4-(8/3 - 8)) - (1/2 × 4-(-8/3 + 8))
= (-8/3 - 8/3) + 8 + 8
= -16/3 + 16
= 32/3 satuan luas