= -2x - 3x - 8y + 7y + 5
= -5x - y + 5
3) (4a - 9b) + (3a + 5b)
Cara:
= (4a - 9b) + (3a + 5b)
= 4a - 9b + 3a + 5b
= 4a + 3a + 5b - 9b
= 7a - 4b
4) (5x + 2y) - (6x - 4y)
= -2x - 3x - 8y + 7y + 5
= -5x - y + 5
3) (4a - 9b) + (3a + 5b)
Cara:
= (4a - 9b) + (3a + 5b)
= 4a - 9b + 3a + 5b
= 4a + 3a + 5b - 9b
= 7a - 4b
4) (5x + 2y) - (6x - 4y)
Editor: Iman Fakhrudin