TestPrep1

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

This topic has expert replies

Post new topic Post Reply

Previous Topic Next Topic

moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

TestPrep1

by moneyman » Mon Feb 25, 2008 7:56 am

Is sq.rt(x-3)^2=3-x?

(1) x not equal to 3

(2)-x|x|>0

OA is B

Is sq.rt(x-3)^2 = (x-3) so that the square gets cancelled inside the sq.root??

Pls explain the answer

Maxx

Quote

Source: Beat The GMAT — Data Sufficiency | Mon Feb 25, 2008 7:56 am

camitava: Legendary Member; Posts: 645; Joined: Wed Sep 05, 2007 4:37 am; Location: India; Thanked: 34 times; Followed by:5 members

by camitava » Mon Feb 25, 2008 8:24 am

moneyman,
the qs is saying - sq.rt(x-3)^2 i.e. (x - 3) or -(x - 3) just like sqrt(4) = 2 or -2.
Now with the stmt-1, x not eq 3 -> x can be > 3 so x - 3 is positive or x can be <3>0 means x is negative and thus x <3> 0. so this is sufficient. so imo b.

Correct me If I am wrong

Regards,

Amitava