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D : x² - 10x + 25 ≠ 0
(x - 5)² ≠ 0
(x - 5)(x - 5) ≠0
x - 5 ≠ 0
x ≠ 5
D : x ∈ R \ { 5 }
(4x² - 100)/(x² - 10x + 25) = 4(x² - 25)/(x - 5)² =
= 4(x - 5)(x + 5)/(x - 5)² =
=4(x + 5)/(x - 5)