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a - b = 9, ab = 10 find the value of a + b1. 112. 123. 164. 22 |
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Answer» Correct Answer - Option 1 : 11 Given: a - b = 9 ab = 10 Formula Used: (a – b)2 = (a + b)2 – 4ab Calculation: substituting the values in the formula 92 = (a + b)2 – 4 × 10 ⇒ 81 + 40 = (a + b)2 ⇒ (a + b)2 = 121 Taking root on both sides a + b = 11 ∴ The value of a + b is 11 |
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