Question

What is the exact value of the expression sqrt(189) - sqrt(21) + sqrt(84) ? Simplify if possible.

Answer 1

I say it's 0.
And that's an understatement.

Answer 2

I have multiple choice, you want the answers?

Answer 3

I'll post them for you.

Answer 4

a √ 21
b 6 √ 7
c4√ 21
d24√ 7

Answer 5

The answer is


sqrt(189) - sqrt(21) + sqrt(84) =
sqrt(9 * 21) - sqrt(21) + sqrt(4 * 21) =
3 * sqrt(21) - sqrt(21) + 2 * sqrt(21) =
4 * sqrt(21)

Answer 6

Thanks to http://answers.yahoo.com/question/index?qid=20101226103625AAFvk0a

Cheater.

geez.

Don't go there for the rest of the answers.
It's just not right.

Answer 7

But give me a medal.
Because you can.
Click dat best answer button.

Answer 8

Yay!! I guessed right