a + (b + 1) = (a + b) + 1    Def

a + (1 + 1) = (a + 1) + 1

a + ((1 + 1) + 1) = ((a +

a
2
± √

4
‒ b




x + iy =
a
2
± √

4
‒ b


a = 2x


‒ 1y = √

4
‒ b


y = √b ‒

4


y² +

4
= b