Results 1 to 5 of 5

Math Help - Calc.3 plane etc.

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    47

    Calc.3 plane etc.

    Im trying to understand the steps to finding a point on the surface where the tangent plane is perpendicular to following tangent plane

    <br /> <br />
x+y+z=11<br /> <br />
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,803
    Thanks
    1692
    Awards
    1
    The plane x+y+x=11 has normal vector <1,1,1>.

    Find points on the surface at which the gradient is parallel to that vector.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2009
    Posts
    47
    on the surface of which vector?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,803
    Thanks
    1692
    Awards
    1
    Quote Originally Posted by statman101 View Post
    to finding a point on the surface where the tangent plane is perpendicular to following tangent plane
    I have no idea what the surface is.
    You posted the above problem. I assumed that you had a surface to work from.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Apr 2005
    Posts
    16,004
    Thanks
    1660
    Quote Originally Posted by statman101 View Post
    on the surface of which vector?
    This makes no sense. A "vector" does not have a surface! If your surface is given by f(x, y, z)= constant, then \nabla f is perpendicular to the surface. That vector must be parallel (so a multiple of) <1, 1, 1>. Now, what surface are you talking about?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. A few Pre-Calc problems in my AP Calc summer packet
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: August 30th 2010, 03:40 PM
  2. Replies: 1
    Last Post: January 13th 2010, 11:57 AM
  3. Replies: 3
    Last Post: January 27th 2009, 12:53 PM
  4. Calc 1 area of plane curve
    Posted in the Calculus Forum
    Replies: 2
    Last Post: December 7th 2008, 11:59 AM
  5. Replies: 0
    Last Post: November 19th 2008, 06:04 AM

Search Tags


/mathhelpforum @mathhelpforum