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f'(x) = x² + 8x - 20
f'(x) = 0 (untuk mencari titik balik)
x² + 8x - 20 = 0
(x + 10)(x - 2) = 0
x₁ = -10
x₂ = 2
untuk x₁
f(-10) = 1/3(-10)³ + 4(-10)² - 20(-10) + 25
= -1000/3 + 400 + 200 + 25
= -1000/3 + 625
= (-1000 + 1.785)/3
= 875/3
untuk x₂
f(2) = 1/3(2)³ + 4(2)² - 20(2) + 25
= 8/3 + 16 - 40 + 25
= 8/3 + 1
= (8 + 3)/3
=11/3