(1) Because x-3y-2=0 and 3y-x=-2, (-8) y) 2 divided by 4 x = 4 (3y) divided by 4x = 4(3y)-x = 4(-2).

(2) because (x+a) (2x-b) = 2x 2-3x-5, that is, 2x 2+(2a-b) x-ab = 2x 2-3x-5, so b-2a=3 and ab=5, the solution is A 1 = 65438. A2=-5/2, b2=-2. When a 1= 1 and b 1=5, 4a2+B2 = 29; When a2=-5/2 and b2=-2, 4A 2+B 2 = 29. So the value of 4a 2+b 2 is 29.