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y = 3x
y = y
x² - 2x = 3x
x² - 5x = 0
D = (-5)² = 25
Luas
L = D√D / 6a²
L = 25√25 / (6•1²)
L = 125/6 sl
3x = x² - 2x
0 = x² - 5x
x = 0 atau x = 5
L = ₀⁵∫ 5x-x² dx
= (5/2)x² - (1/3)x³ |₀⁵
= (125/2 - 125/3 ) - 0
= 125/6