1-a+2a-3- 1=0,a-3=0,a=3
2. The original formula is, y =-x 2+2x+3.
When x= 1, y =-12+2 *1+3 = 4.
14, substitute x value, 4(2-m)=2+2m.
8-4m = 2+2m
6m=6
m= 1