1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Answer check please

  1. Mar 8, 2005 #1
    If anyone could check this answer for me, it would be greatly appreciated.

    Find the equations relating the differentials on the curve [tex] 9y^2= x^3 +3x^2 [/tex] at the points [tex] (1,\frac{2}{3}), (-2,\frac{2}{3}), (-3,0) [/tex]

    Here's what I got:

    [tex] y'= \frac {x^2+2x}{6y} [/tex]

    [tex] m @ (1,\frac{2}{3})= \frac {3}{4} [/tex]
    equation: 9x-12y-1=0

    [tex] m @ (-2,\frac{2}{3})=0 [/tex]
    equation: y= 2/3

    [tex] m @ (-3,0) [/tex]
    does not exist

    Thanks in advance.
  2. jcsd
  3. Mar 8, 2005 #2


    User Avatar
    Science Advisor

    Everything appears correct except the last item.

  4. Mar 8, 2005 #3
    Thanks for the help.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Answer check please
  1. Check my answer please (Replies: 1)