Hi, I'm given the function f(x,y)= sqrt(x^2+y^2) and the points (3.01, 3.98). I think that once plugging the points in is simple enough but I'm confused as to where to begin. Am I supposed to just take the derivative of the entire function? Which I believe would lead to (1/2(x^2+y^2)^-1/2)+(2x^-1/2+2y^-1/2).^-1/2+2y^-1/2). Thank you in advance