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      Question

      If (a + b) = 13 and ab = 18, find the value of (a² +

      b²).
      A 171 Correct Answer Incorrect Answer
      B 158 Correct Answer Incorrect Answer
      C 133 Correct Answer Incorrect Answer
      D 142 Correct Answer Incorrect Answer

      Solution

      ATQ, (a + b)² = 13² Or, a² + b² + 2ab = 169 Or, a² + b² + 36 = 169 So, a² + b² = 169 - 36 = 133

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