Pertanyaan

Diketahui vektor α = 2 i − j , b = 2 i − k , dan c = 3 i + j + 2 k . Hasil α + 2 b − c adalah ...

  1. negative i plus 2 j minus 4 k

  2. 5 i minus 3 j

  3. i minus 2 j plus 2 k

  4. undefined

  5. 3i-2j+4k

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N. Mustikowati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

alpha with rightwards arrow on top equals 2 i with rightwards arrow on top minus j with rightwards arrow on top equals open parentheses table row 2 row cell negative 1 end cell row 0 end table close parentheses  b with rightwards arrow on top equals 2 i with rightwards arrow on top minus k with rightwards arrow on top equals open parentheses table row 2 row 0 row cell negative 1 end cell end table close parentheses  c with rightwards arrow on top equals 3 i with rightwards arrow on top plus j with rightwards arrow on top plus 2 k with rightwards arrow on top equals open parentheses table row 3 row 1 row 2 end table close parentheses  Hasil space dari space straight alpha with rightwards arrow on top plus 2 straight b with rightwards arrow on top minus straight c with rightwards arrow on top space adalah space...  open parentheses table row 2 row cell negative 1 end cell row 0 end table close parentheses plus 2 open parentheses table row 2 row 0 row cell negative 1 end cell end table close parentheses minus open parentheses table row 3 row 1 row 2 end table close parentheses equals open parentheses table row cell 2 plus 4 minus 3 end cell row cell negative 1 plus 0 minus 1 end cell row cell 0 minus 2 minus 2 end cell end table close parentheses equals open parentheses table row 3 row cell negative 2 end cell row cell negative 4 end cell end table close parentheses equals 3 i with rightwards arrow on top minus 2 j with rightwards arrow on top minus 4 k with rightwards arrow on top

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