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8. (a-7)(a+7)
= 4x^2 + 10x + 10x + 25
= 4x^2 + 20x +25
5. 3p(p + 2q -3) = 3p^2 + 2pq - 9p
6. (3m - 7n)(2m - 2n)
= 21m^2 - 6mn - 14mn + 14n^2
= 21m^2 - 20mn + 14^2
7. 6xyz / -4yz = -3x/2
8. a^2 - 49 = (a + 7)(a - 7)