Assignment:
Q1. f(x,y)= 5 - 3x + 4y, D is the closed triangular region with vertices (0,0), (4,0), and (4,5)
Q2. f(x,y)= x^2 + 2xy + 3y^2, D is the closed triangular region with vertices (-1,1), (2,1), and (-1,-2)
Q3. f(x,y)= 1 + xy - x - y, D is the region bounded by the parabola y=x^2 and the line y=4
Provide complete and step by step solution for the question and show calculations and use formulas.