Assalamualaikum minta tolong dong isiin nomer 11 dan 12,besok dikumpulin... Terimakasih ya:)

11)
3y^2 - xy - 6x^2 - 8y^2 - 2xy + 5x^2
= -5y^2 - 3xy - x^2
= -x^2 - 3xy - 5y^2 (b)

12)
2/(x-1) + 3/(x+1)
= 2(x+1)/(x-1)(x+1) + 3(x-1)/(x-1)(x+1)
= (2x+2)/(x-1)(x+1) + (3x-3)/(x-1)(x+1)
= (2x+2+3x-3)/(x-1)(x+1)
= (5x-1)/(x^2 - 1) (d)