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04 Aug 2021, 06:00
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
70% (01:59) correct
30%
(02:01)
wrong
based on 128
sessions
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Time
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Not Attempted Yet
If x is an integer, is \(4^{x}+4^{-x}=y\) ?
(1) \(2^{x}+2^{-x}=\sqrt{y+2}\)
(2) \(4^{2x}+1=4^{x}y\)
(1) \(2^{x}+2^{-x}=\sqrt{y+2}\)
(2) \(4^{2x}+1=4^{x}y\)
04 Aug 2021, 07:28
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Bunuel
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File comment: D will be the ans as explained in the attachment
IMG_20210804_195643.jpg [ 5 MiB | Viewed 2303 times ]
04 Aug 2021, 09:29
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Answer D - both answers independently are sufficient
