Question

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.

Answer 1

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

fxx = 24x
fyx = 28y^3

plug in the numbers

Answer 2

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