Mathematics, 06.06.2020 06:57 yfgkeyonna

If the sum of the squares of nonnegative real numbers a, b, and c is 39, and ab + bc + ca = 21, then what is the sum of a, b, and c?

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If the sum of the squares of nonnegative real numbers a, b, and c is 39, and ab + bc + ca = 21, then...