Here's the question you clicked on:
shamil98
\[\text{Find}~ f_{xxyzz}~ \text{for} f(x,y,z) = z^4y^3 \ln x\] is this right : \[f_x = \frac{ z^4y^3 }{ x }\] \[f_{xx} = -\frac{ z^4y^3 }{ x^2 }\] \[f_{xxy} = -\frac{ 3z^4y^2 }{ x^2 }\] \[f_{xxyz} = -\frac{ 12z^3y^2 }{ x^2 }\] \[f_{xxyzz} = -\frac{ 36z^2y^2 }{ x^2 }\]
wouldn't you start by finding fz first ?
the problem itself is asking for \[f_{xxyzz}\] the first part is \[f_x\]
the final answer would be same, but your method is incorrect
no, |dw:1388132091438:dw|
so the first part would be: \[f_z = 4z^3y^3 \ln x\]
yes, continue that way ....and you'll get the same final answer :)