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24 Aug 2018, 00:42
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E
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Which of the following is a root of the equation 2x^2 − 20x = 48?
A. -4
B. 2
C. 6
D. 8
E. 12
A. -4
B. 2
C. 6
D. 8
E. 12
Chethan92
Joined: 18 Jul 2018
Last visit: 21 Apr 2022
Posts: 917
Own Kudos:
Given Kudos: 95
Location: India
Concentration: Operations, General Management
Schools: IIMB EPGP'22 (M)
GMAT 1: 590 Q46 V25
GMAT 2: 690 Q49 V34
WE:Engineering (Energy)
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24 Aug 2018, 00:45
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2\(x^2\) − 20x = 48 can be reduced to \(x^2\)-10x-24 = 0.
\(x^2\)-12x+2x-24 = 0
x(x-12) + 2(x-12) = 0
Either x = 12 or x = -2.
E is the answer.
\(x^2\)-12x+2x-24 = 0
x(x-12) + 2(x-12) = 0
Either x = 12 or x = -2.
E is the answer.
24 Aug 2018, 02:54
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Bunuel
Which of the following is a root of the equation 2x^2 − 20x = 48?
A. -4
B. 2
C. 6
D. 8
E. 12
A. -4
B. 2
C. 6
D. 8
E. 12
\(2x^2 - 20 = 48\)
\(2(x^2 - 10x) = 48\)
\(x^2 - 10x - 48 = 0\)
\(x^2 - 12x + 2x -48 = 0\)
x( x - 12) +2 ( x - 12) = 0
(x - 12) ( x + 8) = 0
Either x -12= 0 or x =12,
or
x + 2 = 0 or x = -2.
The best answer is E.
