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07 Mar 2016, 08:52
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
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Question Stats:
80% (01:21) correct
20%
(01:54)
wrong
based on 313
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Which of the following equations has a root in common with x^2−7x+12=0 ?
A. x^2+1=0
B. x^2−x−12=0
C. x^2−8x−4=0
D. 3x^2−9=0
E. x^2+x-6=0
A. x^2+1=0
B. x^2−x−12=0
C. x^2−8x−4=0
D. 3x^2−9=0
E. x^2+x-6=0
nipunjain14
Joined: 07 May 2015
Last visit: 12 Aug 2017
Posts: 150
Given Kudos: 21
Location: India
Schools: ISB '19 Kellogg '20 Yale '20 HEC Dec"18
GMAT 1: 660 Q48 V31
GPA: 3
07 Mar 2016, 20:12
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roots for x^2 - 7x+12 = 0 are 4 and 3
only equation
x^2 - x - 12 = 0 has a same similar root
Ans: B
only equation
x^2 - x - 12 = 0 has a same similar root
Ans: B
15 Jun 2016, 03:20
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factorize \(x^2\)-\(7x\)+\(12\) we get (\(x-3\))(\(x-4\))
So roots of the equation are 3 and 4
substitute both these values to see which option gives 0 as answer
(Note - only 1 of the roots will satisfy the equation)
in option B \(x^2\)-\(x\)-\(12\) if we substitute x= 4 we get the answer as 0
Correct Answer - B
So roots of the equation are 3 and 4
substitute both these values to see which option gives 0 as answer
(Note - only 1 of the roots will satisfy the equation)
in option B \(x^2\)-\(x\)-\(12\) if we substitute x= 4 we get the answer as 0
Correct Answer - B
