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(a+b)^2 = a^2 + 2ab + b^2
⇔ (a+b)^2 - 2ab = a^2 + b^2
⇔ 6^2 - 2.4 = a^2 + b^2
⇔ a^2 + b^2 = 36 - 8 = 28.
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