What is the gradient of f(x,y,z) = sqrt(x+yz) and what is it evaluated at the point(1,3,1) ?

i got <.5(x+yz)^ -.5 , .5z(x+yz)^ -.5 , .5y(x+yz)^ -.5 > and at the point i got <1/4 , 1/4, 3/4 >