Jika f(×) = (2× - 1)^2 (× + 2), maka f'(×) = ...

Langsung aja y

f(x) = (2x - 1)² (x + 2)
f(x) = (4x² - 4x + 1)(x + 2)
f(x) = 4x³ - 4x² + x + 8x² - 8x + 2
f(x) = 4x³ + 4x² - 7x + 2

turunan
f'(x) = 3.4x² + 2.4x - 7 + 0
f'(x) = 12x² + 8x - 7

Semoga berguna +_+