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14. Scalar triple product example ( Enter your problem )
  1. Example-1
  2. Example-2

1. Example-1





1. Find Scalar triple product
`A=(1,2,3)`, `B=(4,5,6)`, `C=(2,6,5)`


Solution:
Here `vec A=(1,2,3),vec B=(4,5,6),vec C=(2,6,5)`

`vec A*(vec B xx vec C)`

`=|[A_1,A_2,A_3],[B_1,B_2,B_3],[C_1,C_2,C_3]|`

 = 
 `1`  `2`  `3` 
 `4`  `5`  `6` 
 `2`  `6`  `5` 


 =
 `1` `xx` 
 `5`  `6` 
 `6`  `5` 
 `-2` `xx` 
 `4`  `6` 
 `2`  `5` 
 `+3` `xx` 
 `4`  `5` 
 `2`  `6` 


`=1 xx (5 xx 5 - 6 xx 6) -2 xx (4 xx 5 - 6 xx 2) +3 xx (4 xx 6 - 5 xx 2)`

`=1 xx (25 -36) -2 xx (20 -12) +3 xx (24 -10)`

`=1 xx (-11) -2 xx (8) +3 xx (14)`

`= -11 -16 +42`

`=15`
2. Find Scalar triple product
`A=(5,-1,1)`, `B=(-2,0,4)`, `C=(3,4,5)`


Solution:
Here `vec A=(5,-1,1),vec B=(-2,0,4),vec C=(3,4,5)`

`vec A*(vec B xx vec C)`

`=|[A_1,A_2,A_3],[B_1,B_2,B_3],[C_1,C_2,C_3]|`

 = 
 `5`  `-1`  `1` 
 `-2`  `0`  `4` 
 `3`  `4`  `5` 


 =
 `5` `xx` 
 `0`  `4` 
 `4`  `5` 
 `+1` `xx` 
 `-2`  `4` 
 `3`  `5` 
 `+1` `xx` 
 `-2`  `0` 
 `3`  `4` 


`=5 xx (0 xx 5 - 4 xx 4) +1 xx (-2 xx 5 - 4 xx 3) +1 xx (-2 xx 4 - 0 xx 3)`

`=5 xx (0 -16) +1 xx (-10 -12) +1 xx (-8 +0)`

`=5 xx (-16) +1 xx (-22) +1 xx (-8)`

`= -80 -22 -8`

`=-110`




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