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f(x) = 7x³ + 5x²

f'(x) = 3 × 7x³–¹ + 2 × 5x²–¹

f'(x) = 21x² + 10x¹

f'(x) = 21x² + 10x

f"(x) = 2 × 21x²–¹ + 1 × 10x¹–¹

f"(x) = 42x¹ + 10x⁰

f"(x) = 42x¹ + 10(1)

f"(x) = 42x + 10

❐ Turunan

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f(x) = 7x³ + 5x²

f'(x) = 7(3)(x²) + 5(2)(x)

f'(x) = 21x² + 10x

f''(x) = 21(2)(x) + 10

f''(x) = 42x + 10