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If a + b = 11 and ab = 15, then a2 + b2 is equal to:1. 902. 913. 934. 92 |
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Answer» Correct Answer - Option 2 : 91 Given: a + b = 11 and ab = 15 Formula: (a + b)2 = a2 + b2 + 2ab Calculation: (a + b)2 = a2 + b2 + 2ab ⇒ 112 = a2 + b2 + 2 × 15 ⇒ a2 + b2 = 121 - 30 ∴ a2 + b2 = 91 |
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