[MP PET 1995]
A) $ x<-3 $
B) $ |x|,>3 $
C) $ x\le -3 $
D) $ |x|,<3 $
Correct Answer: B
To be increasing $ f’(x)=3x^{2}-27>0 $
$ \Rightarrow x^{2}>9 $
therefore $ |x|>3 $ .
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