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6x - x² = x² - 2x
x² + x² -2x - 6x = 9
2x² - 8x =0
x(x - 8) = 0
x₁ = 0
x₂ = 8
4x² - 2/3x³]⁸₀
4(8)² - 2/3(8)³ - 0
= 256 - 128/3
= (768 - 128)3
= 640/3 satuan luas