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the value of c so that for all real x the vectors cxi- 6j +3k and xi +2j + 2cxk make an obtuse angle are-

the value of c so that for all real x the vectors 
cxi- 6j +3k  and xi +2j + 2cxk make an obtuse angle are-

Grade:12th pass

1 Answers

Arun
25757 Points
3 years ago
 
there will not be value of c it will be interval
for obtuse angle make dot product product between the vectors negative
we get  cx2 -12+3cx
as x belongs to real u can find out the interval of c easily
 

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