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ritula
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 Posted: Fri Sep 05, 2008 1:09 am Post subject: value of x? |
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What is the value of x?
(1) X^2 – 4 = 0
(2) X satisfies the equation y^2 = x where y is real
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Stuart Kovinsky
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| Posted: Fri Sep 05, 2008 1:21 am Post subject: Re: value of x? |
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| 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.
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