Factoring out the square root?

I’m incredibly and profusely sorry for the “homework” question, but I’ve searched all my available sources for an answer to my inquiry. I have a trig test tomorrow and am utterly confused on how to factor out a square root. The exact problem is finding if there is any number that will factor out of 448. This isn’t the entire problem, considering that I must find the 6 trigonometric functions of a 30–60-90 triangle, so this isn’t a scenario of helping me “slide off easy”. I honestly need the help, and any demonstrations or links would be immensely appreciated. Thank you.