a ( 2 ; 3 )
b ( 0 ; - 1 )
3a = ( 3×2 ; 3×3 ) = ( 6 ; 9 )
- 4b = ( -4×0 ; -4×(-1) ) = ( 0 ; 4 )
v = 3a - 4b = ( 6+0 ; 9+4 ) = ( 6 ; 13 )
6 × 13 = 78
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Answers & Comments
a ( 2 ; 3 )
b ( 0 ; - 1 )
3a = ( 3×2 ; 3×3 ) = ( 6 ; 9 )
- 4b = ( -4×0 ; -4×(-1) ) = ( 0 ; 4 )
v = 3a - 4b = ( 6+0 ; 9+4 ) = ( 6 ; 13 )
6 × 13 = 78