Question

how do i subtract 2 radical 15 - 5 radical 2?

Answer 1

depends what you are doing. You can write it as
\[ 2\sqrt{15}-5\sqrt{2} \]
which is as simple as you can get it. However, you could use a calculator and change it to an (approximate) decimal number.

Answer 2

Ohh alright, then I'm probably doing something wrong on my math problem :/