Find the equation of the tangent plane to the surface f(x,y)=x2yf(x, y) = x^2 yf(x,y)=x2y at the point (1,2,2)(1, 2, 2)(1,2,2).
4x+y−z=44x + y - z = 44x+y−z=4
4x+y−z=24x + y - z = 24x+y−z=2
2x+y−z=22x + y - z = 22x+y−z=2
x+2y−z=3x + 2y - z = 3x+2y−z=3