tolong jawab ya pakai cara no 8,9,10,11,12

Nomor 12
= 4x² - 9
= (2x + 3)(2x - 3)

Jawaban A.

Nomor 11.
= (x - 3y) (2x + 5y)
= 2x² + 5xy - 6xy - 15y²
= 2x² - 15y² - xy

Jawaban B

Nomor 9.
U3 = 6
U5 = 18

Ditanya U10..
Jawaban

U3 - U5 = 6 - 18
2b - 4b = -12
-2b = -12
b = 12/2
b = 6

Maka, nilai a dapat di cari :
U3 = a + 2b
6 = a + 2(6)
6 - 12 = a
- 6 = a

Maka U10 adalah
U10 = a + 9b
U10 = (-6) + 9(6)
U10 = 54 - 6
U10 = 48

Jawaban A..