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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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