(a - b)² = a² - 2ab + b²
x² - 8x + 16 = x² - 2*4*x + 4² = (x - 4)²
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(a - b)² = a² - 2ab + b²
x² - 8x + 16 = x² - 2*4*x + 4² = (x - 4)²