Group 5c-2c and 7d-3d and it comes to 3c+4d
(a + b)(b - 2c)
-60 - 17 + (4-1)d + (10-2)c = -77 + 3d + 8c.
4ac + 2ad + 2bc +bd = 2a*(2c + d) + b*(2c + d) = (2c + d)*(2a + b)
4c+1-5+2c = 6c-4.
0
Group 5c-2c and 7d-3d and it comes to 3c+4d
(a + b)(b - 2c)
(a + b)(b - 2c)
-4
4
2c + 4 - 3c = -9 + c + 5 -c + 4 = c - 4 -2c = -8 2c = 8 c = 4
-60 - 17 + (4-1)d + (10-2)c = -77 + 3d + 8c.
c + c + 2c + c + c = 6c
4ac + 2ad + 2bc +bd = 2a*(2c + d) + b*(2c + d) = (2c + d)*(2a + b)
4c+1-5+2c = 6c-4.
It is: 2c+8