Jawabanmu

2014-02-19T17:18:21+07:00
Mungkin
P=(-    \frac{b}{2a} , \frac{D}{-4a} )
P=(- \frac{-6}{2.1} , \frac{-6^{2}-4.1.18}{-4.1}  )
P=( \frac{6}{2} , \frac{-6^{2}-4.1.18}{-4.1} )
P=(3,-36)