x2 - 10x + 25 = 0
x² + 10x + 25 = 0
(x² + 10x) + 25 = 0
(x² + 10x + 25 - 25) + 25 = 0
(x + 5)² - 25 + 25 = 0
(x + 5)² = 0
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x2 - 10x + 25 = 0
x² + 10x + 25 = 0
(x² + 10x) + 25 = 0
(x² + 10x + 25 - 25) + 25 = 0
(x + 5)² - 25 + 25 = 0
(x + 5)² = 0