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Which of the following must be equal to zero for all real numbers x ?
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20 Dec 2021, 01:47
20 Dec 2021, 01:47
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Question Stats:
85% (00:36) correct
14% (01:01) wrong based on 7 sessions
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Which of the following must be equal to zero for all real numbers x ?
I. x^n/x^n
II. 1/x
III.(-x) + x
A I only
B III only
C I and II only
D I and III only
E II and III only
I. x^n/x^n
II. 1/x
III.(-x) + x
A I only
B III only
C I and II only
D I and III only
E II and III only
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Re: Which of the following must be equal to zero for all real numbers x ?
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20 Dec 2021, 06:41
20 Dec 2021, 06:41
Carcass wrote:
Which of the following must be equal to zero for all real numbers x ?
I. x^n/x^n
II. 1/x
III.(-x) + x
A I only
B III only
C I and II only
D I and III only
E II and III only
I. x^n/x^n
II. 1/x
III.(-x) + x
A I only
B III only
C I and II only
D I and III only
E II and III only
Test x = 1 and n = 1 to get:
I. x^n/x^n = (1^1)/(1^1) = 1/1 = 1
II. 1/x = 1/1 = 1
III.(-x) + x = (-1) + 1 = 0
Since I and II don't always equal zero, we can eliminate A, C, D and E.
Answer: B
gmatclubot
Re: Which of the following must be equal to zero for all real numbers x ? [#permalink]
20 Dec 2021, 06:41
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