2 times radical 5 or
about 4.472135955
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2 radical 30
Here is an example, radical 20 plus radical 5. Now radical 20 is 2(radical 5) so we can add radical 5 and 2 radical 5 and we have 3 radical 5.
Well, darling, radical 5 plus 2 radical 5 is simply 3 radical 5. It's like adding apples to apples, just with more math and less fruit. So, go ahead and flaunt that math prowess like a boss!
-2 √5 + 3 √5 = (-2 + 3) √5 = 1 √5 = √5
radical 3 or 6