7^2 = 25 + 2ab

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• a + b = 7 \quad \text{(1)}
• a^2 + b^2 = 25 \quad \text{(2)}
• Substitute (1) and (2) into the identity:
• = 25 + 2ab
• 2ab = 49 - 25 = 24
• ab = \frac{24}{2} = 12

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