(x + 4)(2x + 1) = 2x² + 9x + 4
(x - 4)(x - 5) = x² - 9x + 20
(x + 2)(x + 6) = x² + 8x + 12
(x - 10)(x +2) = x² - 8x - 20
(x + 3)(x + 3) = x² + 6x + 9
(x + 2)(2x + 2) = 2x² + 6x + 4
(2x + 1)(x + 4) = 2x² + 9x + 4
