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f(x,y) = x^2+y^2+4x-4y Find the extreme values of f on the circle x^2+y^2 = 9 by...

f(x,y) = x^2+y^2+4x-4y

Find the extreme values of f on the circle x^2+y^2 = 9 by using Lagarange Multiplier method and find where does f have maxima and minima on the dis x^2+y^2 <=9

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