aljabar no 7-12 tolong

7. 5a²b - ab² - 7a²b + 6ab²
= -ab² + 6ab² + 5a²b - 7a²b
= 5ab² - 2a²b (a)

8. 2p + 3q - 4 + p - 3q + 2
= 2p + p + 3q - 3q - 4 + 2
= 3p - 2 (b)

9. 6xy + 3yz + 4z + 2xy + 4yz - 4z
= 6xy + 2xy + 3yz + 4yz + 4z - 4z
= 8xy + 7yz (a)

10. 7a² + 2a - 6a² - 12a
= 7a² - 6a² + 2a - 12a
= a² - 10a (c)

11. p + 5 - (-3(2p+1))
= p + 5 + 3(2p + 1)
= p + 5 + 6p + 3
= p + 6p + 5 + 3
= 7p + 8 (d)

12. (2x+3)(3x-5)
= 6x² - 10x + 9x - 15
= 6x² - x - 15 (a)

maaf kalo salah^^