http://img508.imageshack.us/my.php?image=graphah5.png

The diagram shows the curve with the equation y = (x+3)(x-1)^3 which crosses the x-axis at P and Q and has a minimum point at R

a) write down the coordinates of P and Q

b) find the coordinates of R

i am really stuck here but have a feeling its easier than i think. any help would be great