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Verified answer
Y = x² + 2x - 8batas sb x ---> y = 0
x² + 2x - 8 = 0
a = 1
b = 2
c = -8
D = b² - 4ac = 36
Luas
= D√D /6a²
= 36√36 / 6
= 36 satuan luas