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x² - 4x + 4 = x ⇔ x² - 5x + 4 = 0 ⇔ (x-1)(x-4) = 0 maka x1 = 1 dan x2 = 4
Vol = π integral dgn batas bawah 1 dan atas 4 dari { x - (x² - 4x + 4)}dx
= π integral batas bawah 1 dan atas 4 dari (-x² + 5x - 4)dx
= π(-1/3 x³ + 5/2 x² - 4x) batas bawah 1 dan atas 4
= π(-64/3 + 40 - 16 - ( -1/3 + 5/2 - 4)
= π(-21 + 24 + 3/2)
= 9π/2 satuan volum
f(x) = 2/3(t+1)^3/2 batas bawah 0 dan atas x³
= 2/3{(x³ + 1)^3/2 - 1}
f '(x) = (2/3)(3/2)(3x²)(x³+1)^1/2
= 3x²√(x³+1)
f ' (2) = 12√9 = 12(3) = 36