A) \[x>0\]
B) \[x<0\]
C) \[x>1\] only
D) \[x<-1\] only
Correct Answer: B
Solution :
For acute angle \[\mathbf{a}\,.\,\mathbf{b}>0\] i.e., \[-3x+2{{x}^{2}}+1>0\Rightarrow (x-1)(2x-1)>0\] For obtuse angle between \[\mathbf{b}\] and x-axis \[\mathbf{b}\,.\,\mathbf{i}<0\] Þ \[x<0\].You need to login to perform this action.
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