How to rationalise the denominator when it comes out undefined?

Question

$$\frac{3-{\sqrt 5}}{\sqrt 5 + 5}$$

This is probably ridiculously straightforward but I need to get to the answer $$ 1-\frac{2}{5}{\sqrt 5}$$

and can't figure out how to rationalise the denominator bc 5 - 5 = 0 and can't have that on the bottom of a fraction. pls help

Answer 1

Write $$\frac{(3-\sqrt{5})(5-\sqrt{5})}{(5+\sqrt{5})(5-\sqrt{5})}=...$$