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anonymous

  • 5 years ago

find the arc length of f(x)=x^2/2

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  1. anonymous
    • 5 years ago
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    There is a formula for arc length involving an integral that I don't want to type out. However, you do need to find the derivative of f, which in this case is just x. Then plug into your formula for arc length and chug it through the integral. Fan me if this helps. Thanks :p

  2. anonymous
    • 5 years ago
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    i have the formula but i had trouble solving it

  3. anonymous
    • 5 years ago
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    oh ok to solve whats in the integral, you need to use trig substitutions. Did you learn trig substitutions in class? So in this case, I would substitute x=secθ

  4. anonymous
    • 5 years ago
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    i have to find the derivative first, not the integral

  5. anonymous
    • 5 years ago
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    Yeah the derivative is x like i said before

  6. anonymous
    • 5 years ago
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    isn't it x/4

  7. anonymous
    • 5 years ago
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    Bring down the power, which is 2, and that cancels out with the 2 as the denominator. So you are left with x

  8. anonymous
    • 5 years ago
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    this what i did x^2/2--> 2^-1x^2--->4^-1X

  9. anonymous
    • 5 years ago
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    2^-1x^2--->4^-1X this is an error. Because 2^-1(2^1)=2

  10. anonymous
    • 5 years ago
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    Ooops I mean 1

  11. anonymous
    • 5 years ago
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    not 2

  12. anonymous
    • 5 years ago
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    When you multiply two numbers with same base, then you add the exponent

  13. anonymous
    • 5 years ago
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    that is very tricky lol, i dint even notice it. if i get stuck ill post. please check to c if i need help

  14. anonymous
    • 5 years ago
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    Sure. But make sure you fan me

  15. anonymous
    • 5 years ago
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    forsure:) im going to do it rightnow

  16. anonymous
    • 5 years ago
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    i did it

  17. anonymous
    • 5 years ago
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    hey im soo stuck can you click on the link to help me http://www.twiddla.com/505875

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