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Verified answer
Jawaby = x² - 4x
y = 8x - x²
x² - 4x = 8x - x²
2x² - 12 x = 0
a= 2 , b = -12, c = 0
D = b² - 4ac
D = (-12)² -4(2)(0)
D = 144
Luas = D√D/ (6a²)
Luas = 144 (12)/(6)(4)
Luas = 72 satuan