x⁴ + 4x² - 5
x² - 10x + 9
x² + 2x - 35
x⁴ + 6x² + 8
x⁶ + 6x³ + 9
x⁶ + 2x³ - 15
(x² + 4)(x² +2)
(x - 9)(x - 1)
(x² + 5)(x² - 1)
(x + 7)(x - 5)
(x³ + 3)²
(x³ + 5)(x³ - 3)
