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hang254

  • one year ago

Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.

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  1. myininaya
    • one year ago
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    ok u=<7,-3> do you know how to find 4u or 4<7,-3>?

  2. hang254
    • one year ago
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    no, I'm not very good with this topic at all

  3. myininaya
    • one year ago
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    this is going to blow your mind but this pretty easy to do example: pretend we have u=<1,-2> and we are asked to find 5u 5u=5<1,-2>=<5(1),5(-2)>=<5,-10>

  4. hang254
    • one year ago
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    alright

  5. myininaya
    • one year ago
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    so can you evaluate 4<7,-3> now?

  6. hang254
    • one year ago
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    4u-3v=4<7,-3>, -3<-9,5> = <4(7), 4(-3)> = <28,-12> -3(-9), -3(5) = <27, -15>

  7. hang254
    • one year ago
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    so it's <55, -27>

  8. myininaya
    • one year ago
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    yep that is very good <28,-12>+<27,-15> =<28+27,-12-15> =<55,-27>

  9. hang254
    • one year ago
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    Thank you!

  10. myininaya
    • one year ago
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    np you did it all

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