20 + (-6 × 4) - 2

. pemdas

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

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).

Need on this geometry question. explain how you did it.