A normal is drawn at a point P(x, y) of a curve. It meets the x-axis at Q. If PQ is of constant

length k. Then what is the differential equation describing such curve?

A normal is drawn at a point P(x, y) of a curve. It meets the x-axis a

1.	A normal is drawn at a point P(x, y) of a curve. It meets the x-axis at Q. If PQ is of constant
A.	length k. Then what is the differential equation describing such curve?
B.	y(dy/dx) = ± √(k2 + x2)
C.	y(dy/dx) = ± √(k2 – 2y2)
D.	y(dy/dx) = ± √(k2 – y2)
E.	Depends on the value of k
Answer» D.