Kharen,
(x-1)² = x² - 2.x.1 + 1² = x² + 2x + 1
x² + 2x + 1 + 3x - x - 26 = 0
x² + 2x + 3x - x - 26 + 1 = 0
x² + x - x - 25 = 0
x² - 25 = 0
x² = 25
x = √25
x = 5
S = {5, -5}
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Kharen,
(x-1)² = x² - 2.x.1 + 1² = x² + 2x + 1
x² + 2x + 1 + 3x - x - 26 = 0
x² + 2x + 3x - x - 26 + 1 = 0
x² + x - x - 25 = 0
x² - 25 = 0
x² = 25
x = √25
x = 5
S = {5, -5}