{loadmoduleid 241}
problems:
a) 7 (x + y) + 4 (x + y) =
b) 5 (2y – 3) + 7 (- 3 + 2y) =
c) 6 (4x – 5) – 4 (5 – 4x) =
{loadmoduleid 234}
answers:
a) 7 (x + y) + 4 (x + y) =
7 * (x + y) + 4 * (x + y) =
(x + y) * (7 + 4) =
11 * (x + y)
b) 5 (2y – 3) + 7 (- 3 + 2y) =
5 * (2y – 3) + 7 * (2y – 3) =
(2y – 3) * (5 + 7) =
12 * (2y – 3)
c) 6 (4x – 5) – 4 (5 – 4x) =
You have to change the signs in (5 – 4x) by factoring (- 1)
6 * (4x – 5) – 4 * (- 1) (4x – 5) =
6 * (4x – 5) + 4 * (4x – 5) =
(4x – 5) * (6 + 4) =
10 * (4x – 5)