CAPE Pure Mathematics Unit 1 · May/June 2010 · Paper 1 · Question Q6

\frac{\sqrt{x} - \sqrt{y}}{\sqrt{x} + \sqrt{y}} may be expressed as

1. (A)\frac{x + y}{x - y}
2. (B)\frac{x - y}{x + y}
3. (C)\frac{x + y - 2\sqrt{xy}}{x - y}
4. (D)\frac{x - y + 2\sqrt{xy}}{x + y}