What is the range of this numbers

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

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).

Find the value of x in each case. give reasons to justify your solutions! d q ∈ pr