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  1. Solution : 

    In the question we get,
    9x2 + y2 = 397
    xy = 38

    Now,
    = (3x + y)
    = √9x2 + y2 + 2xy
    = √397 + 2.38
    = √397 + 76
    = √473
    Therefor, The value of 9x2 + y2 will be √473

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