function in thase drections.

$f(x,y,z)=2ln(ay)+4ln(yz)+2ln(xz),P_0(1,1,1)$

$u=(\frac{4}{2\sqrt[\phantom{2}]{22}})i+(\frac{6}{2\sqrt[\phantom{2}]{22}})i+(\frac{6}{2\sqrt[\phantom{2}]{22}})k$

$($Iype exad anowers, using masicals as nesded$)$

In which drection does the functian decroase most rapily?

$v=i+j+k$

$($Type sxact answers, using resicals as needed$)$