Solve:
4x^2 - 4ax + ( a^2 - b^2 )
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⟹ 4x² - 4ax + (a² - b²)
⟹ 4x² - 4ax + a² - b²
⟹ (2x - a)² - b²
⟹ (2x - a - b) × (2x - a + b)
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