Roboguru

Diketahui  dan vektor  dan . Jika , maka tentukanl...

Diketahui size 14px a with size 14px rightwards harpoon with barb upwards on top size 14px equals size 14px 3 size 14px i with size 14px rightwards harpoon with barb upwards on top size 14px minus size 14px 2 size 14px j with size 14px rightwards harpoon with barb upwards on top dan vektor b with size 14px rightwards harpoon with barb upwards on top size 14px equals size 14px minus size 14px i with size 14px rightwards harpoon with barb upwards on top size 14px plus size 14px 4 size 14px j with size 14px rightwards harpoon with barb upwards on top dan z with size 14px rightwards harpoon with barb upwards on top size 14px equals size 14px 7 size 14px i with size 14px rightwards harpoon with barb upwards on top size 14px minus size 14px 8 size 14px j with size 14px rightwards harpoon with barb upwards on top. Jika z with size 14px rightwards harpoon with barb upwards on top size 14px equals size 14px m a with size 14px rightwards harpoon with barb upwards on top size 14px plus size 14px n b with size 14px rightwards harpoon with barb upwards on top, maka tentukanlah size 14px m size 14px plus size 14px n.

  1. horizontal ellipsis 

  2. horizontal ellipsis 

Jawaban:

Perhatikan 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell z with rightwards harpoon with barb upwards on top end cell equals cell m a with rightwards harpoon with barb upwards on top plus n b with rightwards harpoon with barb upwards on top end cell row cell open parentheses table row 7 row cell negative 8 end cell end table close parentheses end cell equals cell m open parentheses table row 3 row cell negative 2 end cell end table close parentheses plus n open parentheses table row cell negative 1 end cell row 4 end table close parentheses end cell row cell negative 8 end cell equals cell negative 2 m plus 4 n end cell row cell negative 8 end cell equals cell negative 2 m plus 4 open parentheses 3 m minus 7 close parentheses end cell row cell negative 8 end cell equals cell negative 2 m plus 12 m minus 28 end cell row cell negative 4 end cell equals cell negative m plus 6 m minus 14 end cell row 10 equals cell 5 m end cell row 2 equals m row blank blank blank row n equals cell 3 m minus 7 end cell row n equals cell 6 minus 7 equals negative 1 end cell row blank blank blank row cell m plus n end cell equals cell 2 plus open parentheses negative 1 close parentheses equals 1 end cell end table end style

 

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