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anonymous

  • one year ago

if f(x)=x^1/2-x and g(x)=2x^3-x^1/2, find f(x)-g(x)

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  1. anonymous
    • one year ago
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    i would really appreciate it if someone would actually help me this time!...

  2. anonymous
    • one year ago
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    ok ill help u

  3. anonymous
    • one year ago
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    thank you somuch!

  4. anonymous
    • one year ago
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    this would be your equation (x^1/2-x)-(2x^3-x^12)

  5. anonymous
    • one year ago
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    Answers are: -2x^3-2x-2x^1/2 -2x^3-2x 2x^3-2x+2x^1/2 -2x^3+2x^1/2

  6. anonymous
    • one year ago
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    okay... my is like my worst subject so, could you explain how to do that? please

  7. anonymous
    • one year ago
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    math*

  8. anonymous
    • one year ago
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    is this what the problem looks like?

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  9. anonymous
    • one year ago
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    yes

  10. anonymous
    • one year ago
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    ok thanks

  11. anonymous
    • one year ago
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    no problem

  12. anonymous
    • one year ago
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    ??...

  13. anonymous
    • one year ago
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    umm hmm this one is tough

  14. anonymous
    • one year ago
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    yeah ik DX

  15. FireKat97
    • one year ago
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    you know that we can write x^1/2 as √x right?

  16. anonymous
    • one year ago
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    i didnt know that

  17. FireKat97
    • one year ago
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    well you should try and remember that its pretty useful :)

  18. FireKat97
    • one year ago
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    so if we have f(x) - g(x) we can write this as (√x - x) - (2x^3 - √x)

  19. FireKat97
    • one year ago
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    do you know how you would simplify - (2x^3 - √x)?

  20. anonymous
    • one year ago
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    thank you so much, math is my worst subject but im almost done with the class. thanks for helping!! (:

  21. anonymous
    • one year ago
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    let me try, but most likely no

  22. anonymous
    • one year ago
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    nope i dont

  23. FireKat97
    • one year ago
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    okay so imagine there is a 1 after the - sign so you have to simplify -1(2x^3 - √x) do you know the FOIL method?

  24. anonymous
    • one year ago
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    i forgot it havent done it in a while

  25. anonymous
    • one year ago
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    is it -2x^3+2x^1/2

  26. anonymous
    • one year ago
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    ?

  27. FireKat97
    • one year ago
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    yup! thats correct!

  28. anonymous
    • one year ago
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    omg thanks so much!!

  29. anonymous
    • one year ago
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    would you mind helping me out i have three more questions left?

  30. FireKat97
    • one year ago
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    so now we have x^1/2 - x - 2x^3 + x^1/2 and we want to simplify this by collecting like terms

  31. FireKat97
    • one year ago
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    were nearlyyyy finished with this question ahahha

  32. anonymous
    • one year ago
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    oh haha i thought we were alredy done lol i already went on to the next question

  33. FireKat97
    • one year ago
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    lol dw we're close

  34. anonymous
    • one year ago
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    can we skip that one ?

  35. anonymous
    • one year ago
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    A machine is set up to cut metal strips of varying lengths and widths based on the time (t) in minutes. The change in length is given by the function l(t)=t^2 - sq. root of t, and the change in width is given by w(t)=t^2 - 2t 1/2. Which function gives the change in area of the metal strips?

  36. FireKat97
    • one year ago
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    okay do you know formula for the area of a rectangle?

  37. anonymous
    • one year ago
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    a=wl

  38. anonymous
    • one year ago
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    Answers: a(t)=t^4+2t a(t)=t^4+2t+3t^5/2 a(t)=t^4-3t^5/2+2t a(t)=t^4+2t-2t^1/2+square root of t

  39. FireKat97
    • one year ago
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    yup so we want to do l(t) x w(t) do you see why?

  40. anonymous
    • one year ago
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    not really

  41. anonymous
    • one year ago
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    wait yes i do

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