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