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selang kemonotonan cek aja di turunan pertamanya
f'(x) = 5x⁴ + 20x³
naik di: 5x⁴ + 20x³ > 0
5x³(x + 4) > 0
x < -4 atau x > 0
turun di: -4 < x < 0
selang kecekungan dr turunan keduanya:
f''(x) = 20x³ + 60x²
naik di:
20x²(x + 3) > 0
x < -3 atau x > 0
turun di:
-3 < x < 0