tolong dijawab ya..makasih

4. 6x^2-10x+9x-15
=6x^2-x-15

1) 5x + 3y - 2 - x + y + 2
= 5x - x +3y +y -2 +2
= 4x +4y. B
2) 2p +3q -4+p-3q +2
= 2p+p +3q -3q -4+2
= 3p -2 B
3) (7a²+2a) - (6a² - 12a)
= 7a²+2a - 6a² +12a
= 7a²-6a² +2a +12a
= a² + 14a D
4) (2x + 3) (3x - 5)
= 6x² - 10x + 9x -15
= 6x² - x -15 D