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tatumlee

  • one year ago

find the range of the function f(x)=4x-1 for the domain {-1,0,1,2,3} how do I do this?

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  1. zepdrix
    • one year ago
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    You plug the domain values into the function, one at a time, and your result is included in the range. Example, here is the first one:\[\large\rm f(-1)=4(-1)-1\]\[\large\rm f(-1)=-5\]So our range looks like this so far: \(\large\rm\{-5,~~,~~,~~,~~\}\) Where the domain value of -1 corresponds to the range value of -5. Make sense? :o

  2. tatumlee
    • one year ago
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    so would the next one be 3?

  3. zepdrix
    • one year ago
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    For the domain value x=0, Hmm no we don't get 3 for the range. Did you mean the one after that? :o

  4. tatumlee
    • one year ago
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    Yes I did, was there more solving to do on the other one?

  5. zepdrix
    • one year ago
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    No, you just skipped a number :) I did -1, 0 comes after that, then 1, <- this is the one you did then 2, then 3

  6. tatumlee
    • one year ago
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    I thought I was doing the one for 0, I don't know how it became the next ones answer

  7. zepdrix
    • one year ago
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    Oh you thought you were doing 0? Ok maybe a little math error then :) let's check.\[\large\rm f(0)=4(0)-1\]4 times 0, is 0,\[\large\rm f(0)=0-1\]So that's not giving us 3, right? :)

  8. tatumlee
    • one year ago
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    I think I might have subtracted 1 from 4 when I was supposed to multiply 4 by 0

  9. zepdrix
    • one year ago
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    So what do you get for that next one? :)

  10. zepdrix
    • one year ago
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    Looks like -1, ya? 0-1 = -1 \[\large\rm\{-5,-1,~~,~~,~~\}\] How bout when you plug x=1 into the function?

  11. tatumlee
    • one year ago
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    this time it would be three because 1 x 4 is 4-1= 3

  12. zepdrix
    • one year ago
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    \[\large\rm Range:\{-5,-1,~3,~~,~~\}\]Ah there we go :)

  13. zepdrix
    • one year ago
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    Almost done ^^ Just a couple more!

  14. tatumlee
    • one year ago
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    7,11?

  15. zepdrix
    • one year ago
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    yay good job \c:/\[\large\rm Range:\{-5,-1,~3,~7,11\}\]

  16. tatumlee
    • one year ago
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    thank you!

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