Complex Numbers And Quadratic Equations question 740
Question: The number of roots of the equation $ |x{{|}^{2}}-7|x|+12=0 $ is [MNR 1995]
Options:
A) 1
B) 2
C) 3
D) 4
Show Answer
Answer:
Correct Answer: D
Solution:
The equation $ (|x|-4)(|x|-3)=0 $
Þ $ |x|=4\Rightarrow x=\pm 4 $
Þ $ |x|=3\Rightarrow x=\pm 3 $
BETA
