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(2x + 3) (x + 1)
2x × x = 2x²
3 × 1 = 3
3 × x = 3x, 2x × 1 = 2x, 3x + 2x = 5x
b. 3x² - 10x + 8
(3x - 4) (x - 2)
c. 3a² - 13a - 10
(3a + 2) (a - 5)