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1) x² - 5x - 36 = (x + 4)(x - 9)
2) x² + 4x - 36 = prima
3) 9x² - 16y^4 = prima
4) 81a^4 - 9b² = 9(9a^4 - b²)
= 9(3a² + b)(3a² - b)
5) x² - 144 = (x + 12) (x - 12)
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