Question

A=2i+3j+k,B=i-j+k find A×B​

Answer 1

Answer:

5i - j -5k

Explanation:

A x B = | i   j   k|

           | 2  3  1 |

          | 1   -1   1 |

        =i(3+1) - j(2-1) + k(-2-3)

        = 5i - j -5k

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Answer 2

Answer:

4I-J-5K

Explanation:

A×B = I J K

2 3 1

1 -1 1

= I [3×1- 1×(-1)] -J[2×1- 1×1]+K[2×-1-3×1]

= I [3-(-1)] -J [2-1] +K[(-2)-3]

=4 I -J-5K