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-   -   Finding derivatives by rule (https://www.askmehelpdesk.com/showthread.php?t=126449)

  • Sep 6, 2007, 01:55 AM
    coclue321
    Finding derivatives by rule
    Hi there I need help on this question

    Find the equation of the normal to the curve y=-x^2+4x at:

    x=2

    I don't know to form the gradient from it to formulate the equation
  • Sep 6, 2007, 02:30 PM
    galactus
    Find the equation of the tangent line at that point. The normal is its perpendicular bisector.

    This isn't that bad. Hint: Where's the vertex of the parabola?

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