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

Solution Summary

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

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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 - ...

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• BEng, Allahabad University, India
• MSc , Pune University, India
• PhD (IP), Pune University, India
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