If a² + b² = 169 and a - b = 5 then ab equals?
- 72
- 84
- 66
- None of these
Explanation
Use (a - b)² = a² - 2ab + b²
5² = 169 - 2ab
25 = 169 - 2ab
2ab = 169 - 25 = 144
ab = 72
Last verified on 06-05-2026
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Use (a - b)² = a² - 2ab + b²
5² = 169 - 2ab
25 = 169 - 2ab
2ab = 169 - 25 = 144
ab = 72
Last verified on 06-05-2026
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