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Verified answer
A. 14a² + 7a = 7a(2a + 1)b. 12rs - 3rs² = 3rs(4 -s)
c. ab - 3a²b + 6ab² + 5ab
= -3a²b + 6ab² + 6ab
= -3ab(a - 2b - 2)
d. 6x(5y - 2) + (3x + 1)(5y - 2)
= 30xy - 12x + 15xy - 6x + 5y - 2
= 45xy - 18x + 5y - 2
= (9x + 1)(5y - 2)