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f(x) = x³ + 6x² + 9x + 6
f'(x) = 3x² + 12x + 9
f"(x) = 6x + 12
0 = 6x + 12
6x = - 12
x = - 2
untuk x = - 2
y = (- 2)³ + 6.(- 2)² + 9.( - 2) + 6
= - 8 + 24 - 18 + 6
= 4
jadi titik belok (- 2 , 4)