Unless otherwise posted, what is the speed limit in a residential area?

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

This is so hard and it’s for a test

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)