the question of mathematical economics please solve it . And ignore (4.5) on second line in picture .

Q#2: Consider the problem (4.5) Max: Xia X2-a (X1 + b-a)- subject to PIXI +P2X2 = m Where a, and b are constants. a. Solve the problem and thereby find the two demand functions X1 = D1 (P1, P2, m) and X2 = D2 (P1, P2, m) b. Check the signs of partials of X1 and X2 w.r.t. P1 and P2 and m. c. Verify that Di and D2 are homogeneous of degree 0