To factor x^{2} + 10x + 25 ,
use the formula a^{2} + 2ab + b^{2} = (a + b)^{2},
noting that here, "a" is "x" and "b" is "5", to get:
x^{2} + 10x + 25 = (x + 5)^{2}.

No more factoring is possible.

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