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a + 2b - 3c = ??
=(2,3,1) + 2(3,0,-2) - (0,2,-5)
=(2,3,1) + (6,0,-4) - (0,2,-5)
=(6,3,-3) - (0,2,-5)
=(6,1,2) selesai
=2i+3j+k+6i-4k-6j-15k
= 2i+6i+3j-6j+k-4k-15k
. =8i-3j-18k