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• 25a² - 35a + 12
= 26a² - 15a - 20a + 12
= 5a(5a - 3) - 4(5a - 3)
= (5a - 4) (5a - 3)
• x² + 3√(3x - 30)
= x² + 3√{3(x - 10)}
• x² + 3√{3x - (+6)}
= x² + 3√{3(x - 2)}
• (x² - 4x) (x² - 4x - 1) - 20
= (x - 5) (x + 1) (x - 2)²
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