The value of square root of (√(-9)^2) is:

-9

9i

3

9

none of these

which one is the right answer?

(Worried)

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- Oct 29th 2008, 03:43 PMalaricepentSquare root of a negative number that is squared
The value of square root of (√(-9)^2) is:

-9

9i

3

9

none of these

which one is the right answer?

(Worried) - Oct 29th 2008, 04:26 PMdjmccabie
i would say the ^2 and the √ cancel each other out leaving -9. But as with every reply i post, im not confident lol

I just typed it into the calc and it reads 9. So basically, im useless lol - Oct 29th 2008, 07:00 PMsuperevilcube
So this is what I see:

(√(-9)^2)

The square root is over the everything, right? Something like sqrt( (-9)^2)? If so:

The answer is 9. First you square (-9), then you will have sqrt( 81), which is just 9.

However, just to clarify, if you have:

[ √(-9) ]^2, then the answer is just -9 because the square and square root cancels out. I hope that helps. - Oct 29th 2008, 07:48 PMShyam
- Oct 29th 2008, 08:06 PMkathrynmath
- Oct 29th 2008, 10:57 PMHallsofIvy