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= 2x² + 5x
2) (x + 3)(x + 4)
= x² + 3x + 4x + 12
= x² + 7x + 12
3) (2a - 5)(2a - 9)
= 4a² - 10a + 18a + 45
= 4a² + 8a + 45
4) (3p - 10)²
= 9p² - 60p + 100
5) (p + 3)(p² - 2p + 1)
= p³ - 2p² + p + 3p² - 6p + 3
= p³ + p² - 5p + 3