sederhanakanlah 1. 4a-2 (a+3b) +3a 2. 3 (x + 2y) - (2x + 6) 3. (x+5) (x-4) 4. (a-3)^2 5. 14a^2bc / 2ab

2. 3x + 6y-2x -6 =x+6y-6
3. (x+5)(x-4)= x²-4x+5x-20=x²+x-20
4.a²-9

1) 4a - 2 (a + 3b) + 3a
= 4a - 2a - 6b + 3a
= 5a - 6b

2) 3 (x + 2y) - (2x + 6)
= 3x + 6y - 2x - 6
= x + 6y - 6

3) (x + 5) (x - 4)
= x² + 5x - 4x - 20
= x² + x - 20

4) (a - 3)²
= a² - 6a + 9

5) 14a²bc
------------------
2ab

= 7ac