PROBLEM SOLVING - tempat bertanya PR Kaskuser (SD, SMP, SMA) - Part 2
Grafik fungsi http://latex.codecogs.com/gif.latex?\fn_jvn%20f(x)=ax^3-bx^2+cx+25 naik, jika http://latex.codecogs.com/gif.latex?\fn_jvn%20\begin{aligned}%20f'(x)&%3E0\\%203ax^2-2bx+c&%3E0\end{aligned} b^2-3ac < 0 dan a>0 bener gak gan?