Find C x D If ..

Question

Find C x D if C = <3, 0, -2> and D = <-1, 3 , 7>

Answer 1

C × D =

 

|  i   j  k |

| 3  0 -2 |

|-1  3  7 |

 

= [(0)(7) - (-2)(3)] i - [(3)(7) - (-2)(-1)] j + [(3)(3) - (0)(-1)] k

 

= 6 i - 19 j + 9 k

 

= ⟨6,-19,9⟩