Question

If x^2+y^2=a where a is a non-constant, which of the following conditions are necessary for d^2y/dx^2?
I. y<0
II. y>0
III. x>0
A) I only
B) II only
C) III only
D) I and III only
E) insufficient info

Answer 1

i think u missed something in Q

Answer 2

Sorry. I edited the question. I'm still confused on it. Thanks.