Given the surface z = f (x,y) = x³ + 2x² + 4xy+y², (a) Enter the partial derivative f₂ (1,2), 囡囡 (b) Enter the partial derivative fy (1,2), (c) Enter the coordinates of the point on the surface where x = 1 and y = 2, in the format (x,y,z). (d) Hence enter the equation of the plane that is tangent to z=f(x, y) at that point. For example, if your equation of the plane is 2x+y+z-5=0 enter 2*x+y+z-5.

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