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
length k. What is the equation of such curve passing through (0, k)?

A. x<sup>2</sup> + 2y<sup>2</sup> = k<sup>2</sup>
B. 2x<sup>2</sup> + y<sup>2</sup> = k<sup>2</sup>
C. x<sup>2</sup> y<sup>2</sup> = k<sup>2</sup>
D. x<sup>2</sup> + y<sup>2</sup> = k<sup>2</sup>
Answer» E.


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