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nickersia

  • 3 years ago

If |8i-j|=|7i+kj| (vectors), find two possible values for k belongs to R. Answers: +4, -4. How?

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  1. amistre64
    • 3 years ago
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    becasue it is asking for the length of the vectors to be equal

  2. nickersia
    • 3 years ago
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    @amistre64 I need step by step how to do it... I undestand why it is +4 and -4

  3. amistre64
    • 3 years ago
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    \[8^2+1^2=7^2+k^2\] \[8^2+1^2-7^2=k^2\]

  4. nickersia
    • 3 years ago
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    Oooooooooh my God! It's that simple! Thank you very much!

  5. amistre64
    • 3 years ago
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    youre welcome

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