Find $f _ { m w } ( x , y )$ for the function $f ( x , y ) = x ^ { 4 } - 9 x ^ { 2 } y ^ { 2 } + 2 x y ^ { 3 } + 6 y ^ { 4 }$
A) $24 x$
B) $92 x ^ { 2 }$
C) $- 15 y ^ { 2 }$
D) $- 36 y$

Question

Quizplus · Accepted Answer

The mixed partial derivative $f_{mw}(x, y)$ is found by differentiating $f(x, y)$ first with respect to $x$ and then with respect to $y$. The correct answer is $-36y$.

Find fmw(x,y)f _ { m w } ( x , y )fmw​(x,y)

Find $f _ { m w } ( x , y )$