dik: vektor a = 2i+3j+k vektor b = 3i-2k vektor c = 2j-5k tentukan : a+2b-3c

Di tanya
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

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