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= 3p² + 2p - 8
= 3p² + 6p - 4p - 8
= 3p(p + 2) - 4(p + 2)
= (3p - 4)(p + 2)
b)
= a² + 6a - 16
= a² - 2a + 8a - 16
= a(a - 2) + 8(a - 2)
= (a + 8)(a - 2)