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04 Aug 2017, 09:17
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
76% (01:21) correct
24%
(01:44)
wrong
based on 501
sessions
History
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Not Attempted Yet
If (x+2)^2 = 225, which of the following could be the value of x−2?
A. 15
B. 13
C. -13
D. -17
E. -19
A. 15
B. 13
C. -13
D. -17
E. -19
04 Aug 2017, 10:10
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Bookmarks
(x+2)^2 = 225 = 15^2
therefore, |x+2| = 15
x+2 = 15 or x+2 = -15
x = 13 or x = -17
x-2 = 13-2 = 11 or x-2 = -17 - 2 = -19
Answer is E
therefore, |x+2| = 15
x+2 = 15 or x+2 = -15
x = 13 or x = -17
x-2 = 13-2 = 11 or x-2 = -17 - 2 = -19
Answer is E
sashiim20
Joined: 04 Dec 2015
Last visit: 05 Jun 2024
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Location: India
Concentration: Technology, Strategy
Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
WE:Information Technology (Consulting)
Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
Posts: 608
04 Aug 2017, 10:59
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Bunuel
\((x+2)^2 = 225\)
\((x+2)^2 = (15)^2\) or \((-15)^2\)
Therefore;
\(x + 2 = (+15)\) or \((-15)\)
Lets check both options.
\(x + 2 = 15\)
\(x = 15 - 2 => 13\)
\(x-2 => 13 - 2 = 11\)
There is no option with this answer.
\(x + 2 = -15\)
\(x = -15 - 2 => -17\)
\(x - 2 => -17 - 2 = -19\)
Answer (E)...
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