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Math Help - Gradient

  1. #1
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    Gradient

    Can anyone help please,

    Find the normal line to the level curve of the surface given by
    x^2 + 3y^2 = 7 at the pointM(2,-1)
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  2. #2
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    Quote Originally Posted by sonia1 View Post
    Find the normal line to the level curve of the surface given by x^2 + 3y^2 = 7 at the pointM(2,-1)
    The direction vector of the line is \nabla \Phi (2, - 1)\text{ where } \Phi  = x^2  + 3y^2  - 7.
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