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Pertanyaan

Diberikan vektor-vektor a = 3 i − 2 j ​ − k ; b = i + 3 j ​ − 3 k dan c = 2 i + j ​ − 2 k . Nilai dari a ⋅ ( b ⇀ + c ) sama dengan ...

Diberikan vektor-vektor ; dan . Nilai dari  sama dengan ...

  1. negative 7

  2. negative 6

  3. 4

  4. 6

  5. 7

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R. Hajrianti

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah D.

jawaban yang benar adalah D.

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Pembahasan

Ingatlah rumus dot product antara dua vektor dan yaitu: Pada soal, diketahui ; dan , maka: Dengan demikian, hasil dari adalah . Oleh karena itu, jawaban yang benar adalah D.

Ingatlah rumus dot product antara dua vektor straight a with rightwards arrow on top equals straight a subscript 1 straight i with rightwards arrow on top plus straight a subscript 2 straight j with rightwards arrow on top plus straight a subscript 3 straight k with rightwards arrow on top equals open parentheses table row cell straight a subscript 1 end cell row cell straight a subscript 2 end cell row cell straight a subscript 3 end cell end table close parentheses dan straight b with rightwards arrow on top equals straight b subscript 1 straight i with rightwards arrow on top plus straight b subscript 2 straight j with rightwards arrow on top plus straight b subscript 3 straight k with rightwards arrow on top equals open parentheses table row cell straight b subscript 1 end cell row cell straight b subscript 2 end cell row cell straight b subscript 3 end cell end table close parentheses yaitu:

straight a with rightwards arrow on top times straight b with rightwards arrow on top equals straight a subscript 1 straight b subscript 1 plus straight a subscript 2 straight b subscript 2 plus straight a subscript 3 straight b subscript 3

Pada soal, diketahui straight a with rightwards arrow on top equals 3 straight i with rightwards arrow on top minus 2 straight j with rightwards arrow on top minus straight k with rightwards arrow on top; straight b with rightwards arrow on top equals straight i with rightwards arrow on top plus 3 straight j with rightwards arrow on top minus 3 straight k with rightwards arrow on top dan straight c with rightwards arrow on top equals 2 straight i with rightwards arrow on top plus straight j with rightwards arrow on top minus 2 straight k with rightwards arrow on top, maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top times open parentheses straight b with rightwards harpoon with barb upwards on top plus straight c with rightwards arrow on top close parentheses end cell equals cell open parentheses table row 3 row cell negative 2 end cell row cell negative 1 end cell end table close parentheses times open parentheses open parentheses table row 1 row 3 row cell negative 3 end cell end table close parentheses plus open parentheses table row 2 row 1 row cell negative 2 end cell end table close parentheses close parentheses end cell row blank equals cell open parentheses table row 3 row cell negative 2 end cell row cell negative 1 end cell end table close parentheses times open parentheses table row cell 1 plus 2 end cell row cell 3 plus 1 end cell row cell negative 3 plus open parentheses negative 2 close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row 3 row cell negative 2 end cell row cell negative 1 end cell end table close parentheses times open parentheses table row 3 row 4 row cell negative 5 end cell end table close parentheses end cell row blank equals cell 3 open parentheses 3 close parentheses plus open parentheses negative 2 close parentheses open parentheses 4 close parentheses plus open parentheses negative 1 close parentheses open parentheses negative 5 close parentheses end cell row blank equals cell 9 minus 8 plus 5 end cell row blank equals 6 end table

Dengan demikian, hasil dari straight a with rightwards arrow on top times open parentheses straight b with rightwards arrow on top plus straight c with rightwards arrow on top close parentheses adalah 6.

Oleh karena itu, jawaban yang benar adalah D.

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