f(x) = (3x² – 2x – 1)⁴
Misalkan
u(x) = 3x² – 2x – 1 maka
u'(x) = 2 × 3x – 2 = 6x – 2
f(x) = (u(x))ⁿ ⇔ f'(x) = n(u(x))ⁿ⁻¹ × u'(x)
f'(x) = 4(u(x))⁴⁻¹ × u'(x)
= 4(3x² – 2x – 1)³ × (6x – 2)
= 4(6x – 2)(3x² – 2x – 1)³
= 2 × 4(3x – 1)(3x² – 2x – 1)³
= 8(3x – 1)(3x² – 2x – 1)³
Kaprikornus, turunan pertama dari f(x) = (3x² – 2x – 1)⁴ yaitu 8(3x – 1)(3x² – 2x – 1)³.