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a). (6a + 5b) (3a - 7b)
= 18a^2 - 42ab + 15ab - 35b^2
= 18a^2 - 27ab - 35b^2
b). (p - 3q) (2p + 5q)
= 2p^2 + 5pq - 6pq + 15q^2
= 2p^2 - pq + 15q^2