tolong kerjain ya...please...

1) (2x - 3y) - 5(2x + 3y)
= 2x - 3y - 10x - 15y
= - 8x - 18y

2) 5(2x - 1) - 7x + 7
= 10x - 5 - 7x + 7
= 3x + 2

3) (2x - 3)(x + 5)
= 2x² - 3x + 10x - 15
= 2x² + 7x - 15

4) (2a - 2)²
= 4a² - 8a + 4

5) 2 (x + 1)(x - 4)
= 2 ( x² + x - 4x - 4)
= 2 (x² - 3x - 4)
= 2x² - 6x - 8