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b. (a - 3) (2a + 5) => 2a^2 + 5a - 6a - 15 =2a^2 - a - 15
c. (p - 3) (p - 7) => p^2 - 7p - 3p + 21 =p^2 - 10p + 21
d. (7p - 3) (8p + 7) => 56p^2 + 49p - 24p - 21 = 56p^2 + 25p - 21