[填空题]
On the Persian Gulf, thexjbcgbf - ,u4)sat z7ap w o3m9-bl.ktz(3q/bre is a small peninsula that can be modelled by the equation y=s k9a pta( b3q/7ztmzb-l3.ow$-0.2 x^{3}+1.2 x^{2}-x$ where x and y are measured in kilometres, as shown in the following diagram. Points $\mathrm{P}$ and $\mathrm{Q}$ are on the coastline.
1. Find the coordinates of $\mathrm{P}$ is ( , ) and $\mathrm{Q}$ is ( , ) .
2. Find the furthest distance that the land protrudes from the coastline.
3 . Find the area of the peninsula，The area of the peninsula is given by A= km$^2$.
