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07 May 2016, 05:42
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
90% (00:57) correct
10%
(00:34)
wrong
based on 10
sessions
History
Date
Time
Result
Not Attempted Yet
In the equation 4|2x + 9| – 12 = 72, what is one possible value of x?
A. –24
B. –15
C. –6
D. 10
E. 12
A. –24
B. –15
C. –6
D. 10
E. 12
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07 May 2016, 07:43
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Bunuel
4|2x+9|-12 = 72
=> 4|2x + 9| = 72+12= 84
=> |2x +9| = 84/4 = 21
=>2x+9 = 21 or -21
if 2x+9=21 then 2x = 21-9 = 12 => x = 6 (not in the answers list)
but if 2x + 9 = -21 then 2x = -21 - 9 = -30 => x = -15
=> the answer is B (-15)
07 May 2016, 08:08
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Bookmarks
Bunuel
\(4|2x + 9| – 12 = 72\)
\(4|2x + 9| = 84\)
\(|2x + 9| = 21\)
Here we can have 2 values of x
1. \(( 2x + 9 ) = 21\)
Or, \(2x = 12\)
Or, \(x = 6\)
2. \(-( 2x + 9 ) = 21\)
Or, \(- 2x - 9 = 21\)
Or, \(- 2x = 30\)
Or, \(x = - 15\)
So Answer will be option (B) - 15
PS : HungNguyen
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