Question 395293
x = one number, 10 - x = other number
Then {{{S(x) = x^2 + (10 - x)^2}}}.
==> {{{S(x)  = 2x^2 - 20x + 100}}}
S is minimum when {{{x = -b/2a = --20/4 = 5}}}.
So the two numbers are 5 and 5.