New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If (x + y) = 10 and xy = 21, then find the value of (x²

    + y²).
    A 62 Correct Answer Incorrect Answer
    B 58 Correct Answer Incorrect Answer
    C 48 Correct Answer Incorrect Answer
    D 54 Correct Answer Incorrect Answer

    Solution

    According to the question,
    (x + y)² = 10²
    ⇒ x² + y² + 2xy = 100
    ⇒ x² + y² + 2(21) = 100
    ⇒ x² + y² + 42 = 100
    ⇒ x² + y² = 100 – 42 = 58

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