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(x - 9)(x + 4)
x² + 4x - 36
(x + 9)(x - 4)
9x² - 16y⁴
(3x - 4y²)(3x + 4y²)
81a⁴ - 9b²
(9a² - 3b)(9a² + 3b)
x² - 144
(x - 12)(x + 12)