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09 Nov 2015, 00:11
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If x is negative, which of the following must be positive ?
I. x^2
II. (-1) x
III. 1/x
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
I. x^2
II. (-1) x
III. 1/x
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
09 Nov 2015, 01:48
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x=-ve
I. x^2
will be positive
II. (-1) x
=-ve*-ve= +ve
will be positive
III. 1/x
=1/-ve =-ve
will be negative
Answer B
I. x^2
will be positive
II. (-1) x
=-ve*-ve= +ve
will be positive
III. 1/x
=1/-ve =-ve
will be negative
Answer B
sashiim20
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Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
Posts: 620
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04 Jul 2017, 16:00
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Bunuel
If x is negative, which of the following must be positive ?
I. x^2
II. (-1) x
III. 1/x
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
I. x^2
II. (-1) x
III. 1/x
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III
\(x\) is negative.
I. \(x^2\)
Any negative number raised to even power will give positive value.
Eg; \((-1)^2 = 1\) ------------- (Must be Positive)
II. \((-1) x\)
\((Negative) * (Negative) = Positive\) --------------- (Must be Positive)
III. \(\frac{1}{x}\)
\(\frac{Positive}{Negative} = Negative\)
Only I and II will be Positive.
Answer (B)...
