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25 Apr 2017, 11:33
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C
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% (01:15) correct
24%
(01:23)
wrong
based on 140
sessions
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If (x − 2)^2 = 100, which of the following could be the value of x + 2 ?
A. −10
B. −8
C. −6
D. 10
E. 12
A. −10
B. −8
C. −6
D. 10
E. 12
25 Apr 2017, 11:40
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SajjadAhmad
If (x − 2)² = 100, which of the following could be the value of x + 2 ?
A. −10
B. −8
C. −6
D. 10
E. 12
A. −10
B. −8
C. −6
D. 10
E. 12
If (something)² = 100, then EITHER something = 10 OR something = -10
So, we can conclude that EITHER x − 2 = 10 OR x − 2 = -10
If x − 2 = 10, then x = 12, which means x + 2 = 14
Check answer choices...not there.
Move on.
If x − 2 = -10, then x = -8, which means x + 2 = -6
Check answer choices...BINGO!
Answer:
Cheers,
Brent
25 Apr 2017, 17:01
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By looking into the options, we can see 12 and -8 are the only possible values for the equation.
Asked us to solve X+2, hence 14 or -6 is our answer.
-6 is only present, hence Option C
Asked us to solve X+2, hence 14 or -6 is our answer.
-6 is only present, hence Option C
