If y2=ax2+bx+c, then y3d2ydx2 is
a constant
a function of x only
a function of y only
a function of x and y
y2=ax2+bx+c⇒2ydydx=2ax+b⇒2dydx2+2yd2ydx2=2a⇒yd2ydx2=a−dydx2⇒yd2ydx2=a−2ax+b2y2⇒yd2ydx2=4ay2−(2ax+b)24y24y3d2ydx2=4ac−b2 is a constant