nilai balik minimum (Ymin) dari y=x3-12x+3 adalah..

x=
[tex] - \frac{ (- 12)}{2.1} = 6[/tex]
y=
[tex] - \frac{(12 {}^{2} - 4.1.3) }{4.1} \\ = - \frac{144 - 12}{4} = - \frac{256}{4} = - 64[/tex]