If i have

$\displaystyle f(x,y) = x^3+4x^2y+4y^3 $

Then are these answers correct?

$\displaystyle f_x = 3x^2+8xy $

$\displaystyle f_y = 4x^2+12y^2 $

$\displaystyle f_{xx}=6x+8y$

$\displaystyle f_{yy}=24y$

$\displaystyle f_{xy}=8 $

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- Sep 15th 2009, 01:37 PMel123[SOLVED] Partial Derivatives
If i have

$\displaystyle f(x,y) = x^3+4x^2y+4y^3 $

Then are these answers correct?

$\displaystyle f_x = 3x^2+8xy $

$\displaystyle f_y = 4x^2+12y^2 $

$\displaystyle f_{xx}=6x+8y$

$\displaystyle f_{yy}=24y$

$\displaystyle f_{xy}=8 $ - Sep 15th 2009, 02:40 PMkhotso
all are correct except fxy

fxy=8x