1.

b^2 - a^2 %2B b^2 %2B a^2 %2B 2*(a*b)=0

Answer»

a^2 + 2ab + b^2 - a^2 + b^2 = 0

2ab + 2b^2 = 0

2b(a + b) = 0

b = 0, - a



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