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10 Feb 2020, 05:22
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A
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Difficulty:
25%
(medium)
Question Stats:
76% (01:14) correct
24%
(01:23)
wrong
based on 62
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What is the value of \((2x – 5)^3\) ?
(1) \((2x)^3 = 216\)
(2) \((2x + 3)^2 = 81\)
(1) \((2x)^3 = 216\)
(2) \((2x + 3)^2 = 81\)
10 Feb 2020, 12:11
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Bunuel
#1
cube root both side s
x=6 sufficient
#2
\((2x + 3)^2 = 81\)[/quote]
solve we get
x= -6 & +3; insufficient
IMO A
14 Feb 2020, 06:06
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Can someone please explain how the second statement is not sufficient to solve the question ? I first squared both sides and divided by 2 to get 3. Is there any other way to solve the second statement ?
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