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3. If a2 + b2 = 13 and ab = 6, find the value of (a + b). |
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Answer» a² + b² = 13------ (1)ab = 6 => 2ab = 12 ------(2)On adding EQUATIONS 1 and 2,a² + b² + 2ab = 13 + 12=> (a+b)² = 25=> a+b = √25=> a+b = +- 5Hence, the VALUE of (a+b) is +5 as well as -5 |
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