If a² + b² = 25 and a + b = 7 then ab equals?
- 11
- 12
- 13
- None of these
Explanation
Use (a + b)² = a² + 2ab + b²
7² = 25 + 2ab
49 = 25 + 2ab
2ab = 49 - 25 = 24
ab = 12
Last verified on 07-05-2026
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Use (a + b)² = a² + 2ab + b²
7² = 25 + 2ab
49 = 25 + 2ab
2ab = 49 - 25 = 24
ab = 12
Last verified on 07-05-2026
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