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16 Feb 2017, 03:37
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:44) correct
12%
(02:24)
wrong
based on 253
sessions
History
Date
Time
Result
Not Attempted Yet
Which of the following is a solution to the equation 4x^2−7x−49=5x+63?
A. 3
B. 4
C. 5
D. 6
E. 7
A. 3
B. 4
C. 5
D. 6
E. 7
16 Feb 2017, 03:55
Kudos
Bookmarks
4x^2-12x-112=0
x^2-3x-28=0
(x-7)(x+4)=0
x = 7 or x = -4
answer is E
x^2-3x-28=0
(x-7)(x+4)=0
x = 7 or x = -4
answer is E
16 Feb 2017, 09:04
Kudos
Bookmarks
Bunuel
\(4x^2 −7x − 49 = 5x + 63\)
Or, \(4x^2 −12x − 112 = 0\)
Or, \(x^2 −3x − 28= 0\)
Or, \(x^2 −7x + 4x − 28= 0\)
Or, \(x( x −7) + 4(x − 7)= 0\)
Or, \((x + 4) ( x −7) = 0\)
So, \(x = -4\) or \(x = 7\)
So, Answer must be (E) 7
