math

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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.

  • math -

    fx = 12x^2 + 7y^4
    fy = 28xy^3 - 10y

    fxx = 24x
    fyx = 28y^3

    plug in the numbers

  • math -

    thanks for helping me. i was stuck trying to solve this.

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