value of x?

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ritula: Senior | Next Rank: 100 Posts; Posts: 89; Joined: Sun Aug 10, 2008 8:35 pm

by ritula » Fri Sep 05, 2008 1:09 am

What is the value of x?

(1) X^2 – 4 = 0
(2) X satisfies the equation y^2 = x where y is real

Philosophers have interpreted world in various ways, the point is to change it!

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Source: Beat The GMAT — Data Sufficiency | Fri Sep 05, 2008 1:09 am

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

Re: value of x?

by Stuart@KaplanGMAT » Fri Sep 05, 2008 1:21 am

ritula wrote:What is the value of x?

(1) X^2 – 4 = 0
(2) X satisfies the equation y^2 = x where y is real

(1) x could be +/-2, so insufficient

(2) if y is a real number, then y^2 must be greater than or equal to 0, which means that x is greater than or equal to 0. That's a lot of possible values: insufficient.

Together, statement (2) means that x can no longer be negative, so the only value of x that satisfies both rules is +2: choose (c), together sufficient.

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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