Answer to Question #3400 in Real Analysis for junel
Thus the sum of two positive numbers is always greater or equal to zero.
If a > 0 and b = 0 then a2 + 02 > 0, analogously for b > 0 and a = 0. Thus we see to satisfy the expression a2 + b2 = 0, a and b must be equal to zero at the same time.
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