Posted by **enigma** on Wednesday, September 26, 2012 at 10:52am.

A function of two variables is given by,

f (x,y) = 4x^3 + 7xy^4 - 5y^2 + 8

Determine, fxx + fyx at x = 4.25 and y = 3.69,

giving your answer to 3 decimal places.

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