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Math Help - Finding critical points

  1. #1
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    Finding critical points

    Consider the function f(x,y)=x^2+y^2+2x^3/
    a) Find and classify all critical points.
    b) Find the absolute extrema on the disk x^2+y^2 <= 1 using Lagrange multipliers to do the boundary.
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    Hello,

    Calculate \frac{\partial f}{\partial x} and \frac{\partial f}{\partial y}


    A critical point is a point where both \frac{\partial f}{\partial x} and \frac{\partial f}{\partial y} are equal to 0.
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    I was more concerned about part b
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