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# If x is a positive integer, then (-2^x)^-2 + (2^-x)^2 =

Author Message
Senior Manager
Joined: 25 Dec 2018
Posts: 307
Location: India
Concentration: General Management, Finance
GMAT Date: 02-18-2019
GPA: 3.4
WE: Engineering (Consulting)
If x is a positive integer, then (-2^x)^-2 + (2^-x)^2 =  [#permalink]

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10 Apr 2019, 12:08
00:00

Difficulty:

65% (hard)

Question Stats:

44% (01:56) correct 56% (03:05) wrong based on 16 sessions

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If x is a positive integer, then $$(-2^x)^{-2} + (2^{-x})^2 =$$

A. 1/2^−2x
B. 1/2^−2x+1
C. 2^(1 -2x)
D. 2^-2x
E. 2^(-2x -1)
Manager
Joined: 21 Feb 2019
Posts: 118
Location: Italy
Re: If x is a positive integer, then (-2^x)^-2 + (2^-x)^2 =  [#permalink]

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10 Apr 2019, 14:27
Solution attached.
Attachments

Scan.pdf [210.92 KiB]

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Re: If x is a positive integer, then (-2^x)^-2 + (2^-x)^2 =   [#permalink] 10 Apr 2019, 14:27
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