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If [ veca vecbvecc]=2 , then find the va...

If `[ veca vecbvecc]=2` , then find the value of `[(veca+2vecb-vecc) (veca - vecb) (veca - vecb-vecc)]`

Text Solution

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`[(veca+2vecb-vecc)(veca-vecb)(veca-vecb-vecc)]`
`=|{:(1,2,-1),(1,-1,0),(1,-1,-1):}|[veca vecbvecc]`
`= 2[veca vecb vecc] = 6`
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