Write an algebraic expression for 12 divided by the sum of h2

What is the pattern in the values as the exponents increase?

Me what is the value of x? showing work would be appreciated - ! : )

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).