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Joint Entrance Examination
Mathematics
Quadratic Equations and Inequalities
Question 52
Question 52 of 157
Easy
MCQ
The number of real solutions of the equation, x2 - |x| - 12 = 0 is :
A
2
B
3
C
1
D
4
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Official solution
|x|2 - |x| - 12 = 0 \[ \Rightarrow \] (|x| + 3)(|x| - 4) = 0 \[ \Rightarrow \] |x| = 4 \[\Rightarrow\] x = \[\pm\]4
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