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Question

If a =i^-j^ and b =-j^+2k^, find a -2b ·a +b .

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Solution

We havea=i-j and b=-j+2ka-2b=i-j -2 -j+2k=i-j+2j-4k=i+j-4ka+b=i-j-j+2k=i-2j+2ka-2b . a+b=i+j-4k . i-2j+2k=1-2-8=-9

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