Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ctmusicgirl7

  • 3 years ago

How do I isolate the x in y = 4x - x^2?

  • This Question is Closed
  1. hartnn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 3

    why do you need to isolate x from there ?

  2. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I need to express the function in terms of y

  3. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Maybe it's just really late....but isn't that already "y"?

  4. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ...ok i meant in terms of x then whoops

  5. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh. Ha ha. Made me confused.

  6. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    basically i need to turn it into a "x=" form instead of "y="

  7. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Herrhhh....What grade/course level is this?

  8. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I actually need this for a calculus proble, but I'm having a brain fart.

  9. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    OH..so ln and e^x and all that?

  10. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i need to find the radii of the "outer circle" and "inner circle" of the cross section that looks like a donut, so in order to express the radius in terms of the equation, i need it in terms of "x="

    1 Attachment
  11. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Or do you have to do derivatives too?

  12. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm using integrals because I need to find the volume of a graph rotated around the y axis

  13. binarymimic
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why dont you just complete a square

  14. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Wait..does that diagram incldue x,y, z planes, or is that just 2D?

  15. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It should be 3D. Okay, the reason why I'm asking this "x isolation" question is because I need to find the volume of the graph of y = 4x - x^2 rotated around the y-axis and bounded by y=0.

  16. hartnn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 3

    completing the square will do it., do you know how to ?

  17. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    That's the whole problem I'm working on right now.

  18. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I tried using the quadrative formula, but I got a numerical answer. Am I using it wrong? I'm having a big brain fart right now T_T

  19. binarymimic
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    if you ever need to solve a quadratic just complete a square

  20. binarymimic
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    in this case you need to solve for x, so complete a square to do it o_o

  21. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm not trying to solve it though. I need to have the x isolated :( Solvng it gives me a numerical answer.

  22. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -I feel really stupid right now lol-

  23. IsTim
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Hey, don't say that, or I'll feel stupid for not remembering anything.

  24. hartnn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 3

    let me give you first few steps.... y= 4x-x^2 = -(x^2-4x+4-4) -y = (x-2)^2-4 now can you isolate 'x' ?

  25. binarymimic
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    they condition us to grow accustomed to f(x)! f(y) is just as important =[

  26. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    GOD BLESS YOU HARTNN lol

  27. ctmusicgirl7
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you everyone, I've got it now :) haha

  28. hartnn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 3

    lol! you too :)

  29. hartnn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 3

    welcome ^_^

  30. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy