1. ## Radical Operations

Let sqrt = square root

sqrt{75} + 2(sqrt{12}) - sqrt{48} =

My answer is 5(sqrt{3}).

The book's answer is 20.

I don't see how 20 can possibly be the answer.

2. You are correct

sqrt{75} + 2(sqrt{12}) - sqrt{48} =

sqrt(25)sqrt(3) + 2sqrt(4)sqrt(3) -sqrt(16)sqrt(3) =

5sqrt(3) + 4sqrt(3) -4sqrt(3) = 5sqrt(3)

3. ## ok...

Originally Posted by Calculus26
You are correct

sqrt{75} + 2(sqrt{12}) - sqrt{48} =

sqrt(25)sqrt(3) + 2sqrt(4)sqrt(3) -sqrt(16)sqrt(3) =

5sqrt(3) + 4sqrt(3) -4sqrt(3) = 5sqrt(3)
I better get new books. My Math A and Math B books are full of errors.

4. I worked one summer as a grad student doing the answers in the back of the book.

Paid little to do it so-- in all honesty I'm surprised there as few mistakes as there are.

5. ## tell me...

Originally Posted by Calculus26
I worked one summer as a grad student doing the answers in the back of the book.

Paid little to do it so-- in all honesty I'm surprised there as few mistakes as there are.
How does one get a job correcting errors posted in the back of math books?

6. The author contacted the Math Department looking for someone and the chairman contacted me.