College prep algebra help please question on picture

Alarge rectangle is divided into four smaller rectangles.

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).

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11