QY/ Find the direction devivative of f(x,y) = x₁² + yet at the paint (2,1), by the dirction of V = i-j

Find the directional derivative of ƒ(x, y, z) = 4x² + 5y² + 4z² at the point (3, 4, -3) in the direction of the origin.

Integrate f(x, y, z) = 2x – 3y? – 2z+3 over the line segment from the origin to (1, 1, 1) and over the line segments from the origin to (1, 1,0) and from (1, 1,0) to (1, 1, 1). -

f(s, t) = S s² + t²' maximum rate of change direction vector (-5,5) X X