What is 8s-3x+4k I’m confused

225/100 of last years cost. write each fraction as a decimal and as a percent

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).

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1