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Which of the following describes all values of x for which 1

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Which of the following describes all values of x for which 1 [#permalink] New post 20 Dec 2012, 09:15
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Which of the following describes all values of x for which 1–x^2 >= 0?

(A) x >= 1
(B) x <= –1
(C) 0 <= x <= 1
(D) x <= –1 or x >= 1
(E) –1 <= x <= 1
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Re: Which of the following describes all values of x for which 1 [#permalink] New post 20 Dec 2012, 09:16
Walkabout wrote:
Which of the following describes all values of x for which 1–x^2 >= 0?

(A) x >= 1
(B) x <= –1
(C) 0 <= x <= 1
(D) x <= –1 or x >= 1
(E) –1 <= x <= 1


1-x^2\geq{0} --> x^2\leq{1} --> -1\leq{x}\leq{1}.

Answer: E.
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Re: Which of the following describes all values of x for which 1   [#permalink] 20 Dec 2012, 09:16
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