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`        The value of x for which the angle between the vectors a=xi-3j-k b=2xi+xj-k is acute and the angle between the vectors b and the axis  of ordinate is obtuse are`
7 years ago

147 Points
```										Dear pallavi
angle between the vectors a=xi-3j-k b=2xi+xj-k is acute so cosΘ >0 or a.b>0   2x2 -3x +1>0
(x-1)(2x-1)>0
x<1/2   or  x>1
angle between the vectors b and the axis  of ordinate is obtuse
so b.j<0
x<0
fo final solution is x<0
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7 years ago
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