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IF bar a=hati+hatj,barb=2hati-hatjand ba...

IF `bar a=hati+hatj`,`barb=2hati-hatj`and `bar r=2hati-4hatj`,then express `barr`as linear combination of `bara` and `barb`

A

a)`barr=2bara+2barb`

B

b)`barr=-2bara+2barb`

C

c)`barr=2bara-2barb`

D

d)`barr=-2bara-2barb`

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