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x² - x - 5x + 5
x(x - 1) - 5(x - 1)
(x - 5)(x - 1)
b. x² + 8x - 20
x² - 2x + 10x - 20
x(x - 2) + 10(x - 2)
(x + 10)(x - 2)
c. x² + 9x + 18
x² + 3x + 6x + 18
x(x + 3) + 6(x + 3)
(x + 6)(x + 3)
d. x² - 12x - 28
x² + 2x - 14x - 28
x(x + 2) - 14(x + 2)
(x - 14)(x + 2)