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Diberikan tiga buah vektor masing-masing: a = 6 p i + 2 p j ​ − 8 k b = − 4 i + 8 j ​ + 10 k c = − 2 i + 3 j ​ − 5 k Jika vektor a tegak lurus b , maka vektor a – c adalah ...

Diberikan tiga buah vektor masing-masing:

 

 

Jika vektor a tegak lurus b, maka vektor a  c adalah ...space

  1. negative 58 i with hat on top minus 20 j with hat on top minus 3 k with hat on top 

  2. negative 58 i with hat on top minus 23 j with hat on top minus 3 k with hat on top 

  3. negative 62 i with hat on top minus 17 j with hat on top minus 3 k with hat on top 

  4. negative 62 i with hat on top minus 20 j with hat on top minus 3 k with hat on top 

  5. negative 62 i with hat on top minus 23 j with hat on top minus 3 k with hat on top 

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A. Aulia

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Jawaban terverifikasi

Jawaban

jawaban yang benar adalah B.

jawaban yang benar adalah B.

Pembahasan

Diketahui : Ditanya : ? Penyelesaian : Vektor a tegak lurus terhadap vektor b, maka Sehingga maka vektor : Dengan demikian, vektor adalah . Jadi, jawaban yang benar adalah B.

Diketahui :

a with rightwards arrow on top equals 6 p space i with hat on top plus 2 p space j with hat on top minus 8 k with hat on top b with rightwards arrow on top equals negative 4 i with hat on top plus 8 j with hat on top plus 10 k with hat on top c with rightwards arrow on top equals negative 2 i with hat on top plus 3 j with hat on top minus 5 k with hat on top 

Ditanya :

a with rightwards arrow on top minus c with rightwards arrow on top ?

Penyelesaian :

Vektor a tegak lurus terhadap vektor b, maka a with rightwards arrow on top times b with rightwards arrow on top equals 0 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards arrow on top times b with rightwards arrow on top end cell equals 0 row cell open parentheses table row cell 6 p end cell row cell 2 p end cell row cell negative 8 end cell end table close parentheses open parentheses table row cell negative 4 end cell row 8 row 10 end table close parentheses end cell equals 0 row cell negative 24 p plus 16 p minus 80 end cell equals 0 row cell negative 8 p end cell equals 80 row p equals cell negative 10 end cell end table 

Sehingga 

a with rightwards arrow on top equals 6 p space i with hat on top plus 2 p space j with hat on top minus 8 k with hat on top a with rightwards arrow on top equals 6 open parentheses negative 10 close parentheses space i with hat on top plus 2 open parentheses negative 10 close parentheses space j with hat on top minus 8 k with hat on top a with rightwards arrow on top equals negative 60 space i with hat on top minus 20 space j with hat on top minus 8 k with hat on top 

maka vektor a with rightwards arrow on top minus c with rightwards arrow on top :

a with rightwards arrow on top minus c with rightwards arrow on top equals open parentheses negative 60 minus open parentheses negative 2 close parentheses close parentheses i with hat on top plus open parentheses negative 20 minus 3 close parentheses j with hat on top plus open parentheses negative 8 minus open parentheses negative 5 close parentheses close parentheses k with hat on top a with rightwards arrow on top minus c with rightwards arrow on top equals negative 58 i with hat on top minus 23 j with hat on top minus 3 k with hat on top 

Dengan demikian, vektor a with rightwards arrow on top minus c with rightwards arrow on top adalah negative 58 i with hat on top minus 23 j with hat on top minus 3 k with hat on top.

Jadi, jawaban yang benar adalah B.

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