1.

If `barc=3bara-2barb`, then prove that `[bara barb barc]0`

Answer» Given `" "vecc=3veca-2vecb`
`therefore" "[vec a vec b vec c]=veca . (vecb xx vec)`
`=veca . [vecb xx (3 veca xx2vecb)]`
`=veca. (3 vecb xx veca - 2 vecb xx vecb)`
`=veca.(3vecb xx vec a -0)`
`(because vecb xx vec b=0)`
`=3xx0=0" Hence proved"`


Discussion

No Comment Found

Related InterviewSolutions