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anonymous

  • one year ago

Which of the following vectors are orthogonal to (1,5)? Check all that apply a. (-2,5) b. (-5,1) c.(-1,-5) d. 10,-2) I'm thinking b and d, can someone confirm whether or not any of the others work and whether or not I'm right?

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  1. phi
    • one year ago
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    do you know how to do a dot product? the dot product of 2 vectors that are orthogonal will be zero.

  2. phi
    • one year ago
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    for example, <-2,5> dot <1,5>= -2*1 +5*5= -2+25= 23 that is not zero, so not choice A

  3. anonymous
    • one year ago
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    Pretty sure it would be "B and D"

  4. anonymous
    • one year ago
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    Ah, I think I got it! (-5,1) and (1,5) =-5+5=0 (-1,-5) and (1,5)=-1+-25=-26 (10,-2) and (1,5)=10+-10=0

  5. Jhannybean
    • one year ago
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    Yeah you got it :) Just make sure you show them as vectors and not points!

  6. anonymous
    • one year ago
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    Good job!

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