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    Question

    If x + y = 10 and xy = 21, find value of x³ +

    y³.
    A 360 Correct Answer Incorrect Answer
    B 225 Correct Answer Incorrect Answer
    C 370 Correct Answer Incorrect Answer
    D 320 Correct Answer Incorrect Answer

    Solution

    ATQ,

    x³ + y³ = (x + y)³ – 3xy(x + y)

    = 1000 – 3×21×10

    = 1000 – 630

    = 370.

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