1) The line 2x+9=3 meets curve xy+y+2=0 at the points P and Q. Calculate the gradient of the curve at P and Q 2)Given that [itex]y=(x^2)/(x-2)[/itex], find a) [itex](d^2)y/dx^2[/itex] in its simplest form b)ther range of value for which [itex]dy/dx[/itex] and [itex](d^2)y/dx^2[/itex] are positive. I can't figure out either of the sums. For the first one I got the answer -1/11 & -44/81 (even though the answer page showed 1/2 and 4/81) and the second I couldn't do. Can anyone do them step by step?