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# Maths help (simple) watch

1. What is
2 root 2 times -root2
I know it equals 8, but what does it equal in roots? If that makes sense.
eg: 2root4 + 4root4 = 6root4 (write it like that) not 12.
2. (Original post by multiplexing-gamer)
What is
2 root 2 times -root2
I know it equals 8, but what does it equal in roots? If that makes sense.
eg: 2root4 + 4root4 = 6root4 (write it like that) not 12.
Um. I dont know. 4root4?

_Kar.
3. The answer is -4.......root2*-root2 = -2 and -2*2 = -4 = -root16
4. Could you tell me the question more clearly as it is either:

1) The information is:
2 Xsqrt(2) X sqrt(2)

If you times the square roots of anything you get the number being rooted in this case

sqrt(2) X sqrt(2) = 2

You then have the orignal times 2 at the beginning of the question which comes to 4 (not 8 so then we try the other meaning of the information)

2) the information is:
2 X sqrt(2) X -sqrt(2)

The same rule of timezing roots applys but you also use a possitive times a negative = a negative which comes out as -4

Where did you get 8 from?
Could you use this calculator to show me what the question really is?

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