Question

Find two numbers a a and b b whose sum a + b a+b is 0 and whose difference a − b a-b is 2. your answer is

Answer 1

The two numbers are a and b.

Because their sum is 0, therefore
a + b = 0 (1)
Because their difference is 2, therefore
a - b = 2 (2)

Add (1) and (2).
a + b + (a - b) = 0 + 2
2a = 2
a = 1
From (1), obtain
1 + b = 0
b = -1

Answer:
a = 1
b = -1