1. Find A.B
`A=(3,1,1)`,`B=(-1,2,1)`
Solution:
Here `vec A=(3,1,1),vec B=(-1,2,1)`
`vec A * vec B`
`=A_1*B_1 + A_2*B_2 + A_3*B_3`
`=3*(-1) + 1*2 + 1*1`
`=-3 + 2 + 1`
`=0`
2. Find B.A
`A=(5,6,1)`,`B=(0,2,3)`
Solution:
Here `vec A=(5,6,1),vec B=(0,2,3),vec C=(5,6,1)`
`vec B * vec A`
`=B_1*A_1 + B_2*A_2 + B_3*A_3`
`=0*5 + 2*6 + 3*1`
`=0 + 12 + 3`
`=15`
This material is intended as a summary. Use your textbook for detail explanation.
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