So, let's say that you have this expression:
(x - a)
and you need to get it under the square root sign. What is the right way to do it?
I came up with two methods, hopefully at least one of them is right. I want to find out which is right and to read more on the topic in order to understand WHY it is right.
I can't find any videos on youtube or texts on the math sites, because I don't know which keywords to use in order to find it - any help would be appreciated.