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    coclue321's Avatar
    coclue321 Posts: 1, Reputation: 1
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    #1

    Sep 6, 2007, 01:55 AM
    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
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Sep 6, 2007, 02:30 PM
    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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