2x² - 8x + 4 = (x-2)²
2x² - 8x + 4 = x² - 4x + 4
x² - 4x = 0
x(x-4) = 0
x = 0
x = 4
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2x² - 8x + 4 = (x-2)²
2x² - 8x + 4 = x² - 4x + 4
x² - 4x = 0
x(x-4) = 0
x = 0
x = 4