Question

sqrt x- sqrt y/sqrt x+sqrt y

Answer 1

\[\frac{\sqrt{x}-\sqrt{y}}{\sqrt{x}+\sqrt{y}} \cdot \frac{\sqrt{x}-\sqrt{y}}{\sqrt{x}-\sqrt{y}}\]
\[=\frac{\sqrt{x}\sqrt{x}-\sqrt{x}\sqrt{y}-\sqrt{y}\sqrt{x}+\sqrt{y}\sqrt{y}}{\sqrt{x}\sqrt{x}-\sqrt{x}\sqrt{y}+\sqrt{y}\sqrt{x}-\sqrt{y}\sqrt{y}}\]
\[=\frac{x-2\sqrt{x}\sqrt{y}+y}{x+0-y}=\frac{x-2\sqrt{xy}+y}{x-y}\]

Answer 2

[2w-16/35\div w-8/25w\]