Hi,
Simply couldn't figure out how to go about cracking this problem. Someone please help!
Thanks.
Shilotilo
GMATPrep square root invoving variables. Help!
This topic has expert replies
- Attachments
-
- GMATPrep square root and variables.doc
- (53.5 KiB) Downloaded 118 times
First it helps to simplify the roots
Change 1/Sqrt(x+y) to:
Sqrt(x+y)/(x+y)
This should make the answer easier to understand.
1) Doesn't have to be bigger. What if x and y are the same number? Then it would be equal.
2) Must be bigger because the sum of the individual sqrts is larger than the sqrt of the sum. Plug a few numbers in to try it out.
3) Must be smaller for the same reason above.
Hope this helps.
Change 1/Sqrt(x+y) to:
Sqrt(x+y)/(x+y)
This should make the answer easier to understand.
1) Doesn't have to be bigger. What if x and y are the same number? Then it would be equal.
2) Must be bigger because the sum of the individual sqrts is larger than the sqrt of the sum. Plug a few numbers in to try it out.
3) Must be smaller for the same reason above.
Hope this helps.