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    Question

    If (a + b) = 10 and ab = 21, find the value of (a² +

    b²).
    A 27 Correct Answer Incorrect Answer
    B 58 Correct Answer Incorrect Answer
    C 32 Correct Answer Incorrect Answer
    D 42 Correct Answer Incorrect Answer

    Solution

    ATQ, (a + b)² = 10² Or, a² + b² + 2ab = 100 Or, a² + b² + 42 = 100 So, a² + b² = 100 - 42 = 58

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