Ka, tolong bantuin ya yg no. 4,6,17,23, sama 30 aja :)

4. (x - 8)(x - 1)
6. (y - 15)(y - 4)
17. (a - 9b)(a - 4b)
23. (10 + y)(3 - y)
30. y(y - 16)(y + 4)

maaf kalo salah
semoga membantu