For question 11, I have done dy/dx=8x-a/x^2=0, I also wrote 32=4x^2+a/x+5. But then I kind of mess up the question. Do I get any marks for writing those two down?
For 10 iv) I put (0,0) into the circle equation then I got root 25<root 45. And then I got r<5 do I get any mark for this question?