Lets say the question says...
whats the value of x?
1. sq root(x) = x-2
solving we get x=4 and x=1
However x=1 doesnt satisfy the above equation...and the ans is x=4...so can we say Statement 1 is sufficient?
Thanks
for DS questions - square root
This topic has expert replies
-
- Junior | Next Rank: 30 Posts
- Posts: 23
- Joined: Wed Apr 18, 2007 7:09 am
- Thanked: 1 times
-
- Master | Next Rank: 500 Posts
- Posts: 106
- Joined: Wed Feb 04, 2009 6:09 am
- Location: Louisville, KY
- Thanked: 8 times
Keep in mind also that if x was 4 you could also end up -2 = 4-2 or -2 = 2.crossingfingers wrote:Lets say the question says...
whats the value of x?
1. sq root(x) = x-2
solving we get x=4 and x=1
However x=1 doesnt satisfy the above equation...and the ans is x=4...so can we say Statement 1 is sufficient?
Thanks
Almost 100% of the time with DS questions and you see anything about sqrt or x^2 you're going to have to deal with +/- signs that usually make one or more statements ambiguous and thus insufficient. You've done a good job picking up on this (I still get tripped up when I rush through questions to fast)