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29 Mar 2014, 16:05
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If x is a negative number, what is the value of x?
(1) x^2 = 1
(2) x^2 + 3x + 2 = 0
(1) x^2 = 1
(2) x^2 + 3x + 2 = 0
29 Mar 2014, 16:12
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If x is a negative number, what is the value of x?
(1) x^2 = 1 --> x=-1 or x=1. Since we are given that x is a negative number, then x=-1. Sufficient.
(2) x^2 + 3x + 2 = 0 --> (x + 1)(x + 2) = 0 --> x=-1 or x=-2. Two values. Not sufficient.
Answer: A.
(1) x^2 = 1 --> x=-1 or x=1. Since we are given that x is a negative number, then x=-1. Sufficient.
(2) x^2 + 3x + 2 = 0 --> (x + 1)(x + 2) = 0 --> x=-1 or x=-2. Two values. Not sufficient.
Answer: A.
General Discussion
26 Jan 2017, 07:07
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Focusing on phrase " x is a negative number" is important otherwise we may choose incorrect answer.
