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Let, vec(a)=2i-2j+3k, vec(b)=i+3j+4k and vec(c)=3i+6j+4k{:[(a) vec(a)+2 vec(b)+3 vec(c)=2i-2j+3k+2(i+3j+4k)+3(3i+6j+4k)],[=2i-2j+3k+2i+6j+8k+9i+18j+12k],[=13i+22j+21k],[(b) vec(a)* vec(b)=(2i-2j+3k)*(i+3j+4k)=2-6+12=8],[(c) ... See the full answer