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    Show that there are exactly four distinct sets of integers which satisfy the attached equations:

    © BrainMass Inc. brainmass.com November 30, 2021, 12:00 am ad1c9bdddf
    https://brainmass.com/math/integrals/equations-distinct-sets-integers-15133

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    x1+x2+x3 = 54 ......(1)
    x1^2 + x2^2 + x3^2 = 1406 ......(2)
    eliminate x3 from (2) using (1), we get,

    >x1^2 + x2^2 + (54- x1 - x2)^2 = 1406
    => 2x1^2 + 2x2^2 + 2x1x2 - 108x1 - 108x2 + 54^2 = 1406
    => x1^2 + x2^2 + x1x2 - 54x1 - 54x2 + 27*27*2 = 703
    Let x2 = k
    => x1^2 + (k - 54)x1 + (k^2 - 54k + 1458 - 703) = 0 ...(3)
    => x1^2 + (k - 54)x1 + (k^2 - 54k + 755) = 0

    Compare with general quadratic eqn,
    ax^2 + bx + c =
    Soln.: x = [-b + or - ...

    Solution Summary

    This shows how to prove there are four distinct sets of integers that satisfy given conditions.

    $2.49

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