2(5c + 2d)(5c + 2d)
The like terms are sums of b terms and c terms separately 5c+2c+3c+4b 5c +2c + 4b + 3c => 10c + 4b
You can't tell a thing about -5c+9 until you know what 'c' is. And every time 'c' changes, -5c+9 changes.
9
5 and 7 are two coefficient. And that is all. There is no third coefficient.
2(5c + 2d)(5c + 2d)
4c2 + 5c + 2c = 4c2 + 7c = c(4c + 7)
15 ac + 20 bc + 6 ad + 8 bd =3a (5c + 2d) + 4b (5c + 2d) =(3a + 4b) (5c + 2d)
9c is.
12c + 2b
The like terms are sums of b terms and c terms separately 5c+2c+3c+4b 5c +2c + 4b + 3c => 10c + 4b
7c+4
It IS expanded.
You can't tell a thing about -5c+9 until you know what 'c' is. And every time 'c' changes, -5c+9 changes.
Group 5c-2c and 7d-3d and it comes to 3c+4d
c2+6c+9 = (c+3)(c+3)
The simplified answer is: 4c+2b