Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

wcaprar Group Title

Find the second derivative of the parametric equation.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. wcaprar Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Parametric Equation: x=9t, y=6t-8 I got dy/dx = \[4/((1/2)t ^{-1/2})\] Now I need to find d^2y/dx^2. And I got \[-t ^{-3/2}/((1/2)t ^{-1/2})^3\] But It says that I got it wrong. Where did I go wrong?

    • 2 years ago
  2. dumbcow Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    wouldn't dy/dx = 2/3 \[\frac{dy}{dx} = \frac{dy}{dt}*\frac{dt}{dx} = 6*\frac{1}{9} = \frac{2}{3}\]

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

    I would have used substitution t = x/9 then y = 6(x/9) - 8 dy/dx = 2/3 then 2nd derivative d^y/dx^2 = 0

    • 2 years ago
  4. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    How did you get: dy/dx = 4/((1/2)t−1/2)?

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.