Question

If a+b=2,a-b=-2 then a²+b²=?

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

a+b=2

a=2-b

;a-b=-2

2-b-b=-2

2-2b=-2

-2b=-4

b=-4+2=2

;a+b=2

a+2=2

a=0

;a²+b²= 0²+2² = 0+4=4