1) 45b + 6a - 3ab - 90 = 3(15b + 2a - ab - 30)2) x^2 - y^2 - x - y = (x + y)(x - y) - (x + y)3) 60 + 6ab - 3ab - 12a = 6ab - 3a(2 - b) - 12a = 3a(2b - 1) - 12a = 3a(2b - 1 - 4) = 3a(2b - 5)4) (3a^2 - a + 2) - (3a^2 + 3a - 1) - (a^2 - 1) = 3a^2 - a + 2 - 3a^2 - 3a + 1 - a^2 + 1 = -4a + 2
1) 45b + 6a - 3ab - 90 = 3(15b + 2a - ab - 30)
2) x^2 - y^2 - x - y = (x + y)(x - y) - (x + y)
3) 60 + 6ab - 3ab - 12a = 6ab - 3a(2 - b) - 12a = 3a(2b - 1) - 12a = 3a(2b - 1 - 4) = 3a(2b - 5)
4) (3a^2 - a + 2) - (3a^2 + 3a - 1) - (a^2 - 1) = 3a^2 - a + 2 - 3a^2 - 3a + 1 - a^2 + 1 = -4a + 2