Latex Test

\begin{array}{l} \frac{d V}{d x}=2700-330 x+6 x^{2} \\ \frac{d v}{d x}=0, \end{array}  \[ \begin{array}{l} y=x^{2}-3 x-4 \\ \text { When } x=0, y=-4 \\ \text { When } y=0, x^{2}-3 x-4=0 \\ (x+1)(x-4)=0 \\ x=-1 \text { or } x=4 \end{array} \] Axes crossing points are: (0,-4),(-1,0) and (4,0) .