(2a-3b)(a+4) = 2aa + 2a4 - 3ba - 3b4 = 2a^2 + 8a - 3ab - 12b(3a-2b)(a-4) = 3aa - 3a4 - 2ba + 2b4 = 3a^2 - 12a - 2ab + 8b
1) 6ab-3b^2 = 3b(2a - b)2) ac+bc-3a-3b = c(a + b) - 3(a + b) = (a + b)(c - 3)
(2a-3b)(a+4) = 2aa + 2a4 - 3ba - 3b4 = 2a^2 + 8a - 3ab - 12b
(3a-2b)(a-4) = 3aa - 3a4 - 2ba + 2b4 = 3a^2 - 12a - 2ab + 8b
1) 6ab-3b^2 = 3b(2a - b)
2) ac+bc-3a-3b = c(a + b) - 3(a + b) = (a + b)(c - 3)