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4 October, 04:49

If a=2i-3j-k and b=i+4j+2k what us ab

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Answers (1)
  1. 4 October, 05:18
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    2i²+5ij+3ik-12j²-10jk-2k²

    Step-by-step explanation:

    a=2i-3j-k

    b=i+4j+2k

    ab = (2i-3j-k) (i+4j+2k)

    Multiply both bracket by expanding the bracket

    2i (i+4j+2k) - 3j (i+4j+2k) - k (i+4j+2k)

    Multiply

    2i²+8ij+4ik-3ij-12j²-6jk-ik-4jk-2k²

    Collect like terms

    2i²+8ij-3ij+4ik-ik-12j²-6jk-4jk-2k²

    2i²+5ij+3ik-12j²-10jk-2k²
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