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pallavi pradeep bhardwaj Grade: 12
        

If a,b,c areunit vectors and a+b+c=i+j-2k,then a.b+b.c+c.a=

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear pallavi


a+b+c=i+j-2k


|a+b+c|2=|i+j-2k|2


|a| +|b| +|c|    +2(a.b +b.c+c.a)  =6


 2(a.b +b.c+c.a)  =6 -3 =3


(a.b +b.c+c.a)  =3/2


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Badiuddin


 

7 years ago
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