SOLUTION: what does 2 radical sign 45 minus 2 radical sign 5 equal

Question 513981: what does 2 radical sign 45 minus 2 radical sign 5 equal

Answer by drcole(72) (Show Source): You can put this solution on YOUR website!
I think that you are being asked to simplify the expression:

The important thing to remember here is that you can break up the square root of a product into a product of square roots:

(Note: it is NOT true that --- for example, does not equal )
We want to break up 45 into a product of a number times a perfect square. One way to do this is:

So
Thus we can rewrite our original expression as:

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