They are 3 terms of an algebraic expression
3b-8b = -5
8b^2 -9b +1 8b^2 -8b -b +1 8b(b-1) - 1(b-1) (8b-1)(b-1)
-8b-48a-40c
8b - 4b = 4b
(11a + 8b)(11a - 8b)
16c-12c equals = 4
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
What I would do is change the problem up. Instead of b-9b I would make it -(9b-b). It is still the same problem; you will multiply the number inside the parenthesis be -1. So start with 9b-b. That would equal 8b. So it would change from -(9b-b) to -(8b) so you multiply 8b by negative 1 (-1) to get the answer -8b. -8b is your answer. So b - 9b = -8b
c in 12c Stand For Cloud
(8a)(8b) = (8c)/(8d); multiply both sides by 8d to obtain (8a)(8b)(8d) = (8c); divide both sides by 8 to obtain (8a)(8b)d = c; divide both sides by (8a)(8b) to obtain d = c/[(8c)(8b)].
(11a-8b)(11a+8b)