tolong dibantu,sederhanakanlah

1a. 6y²+12y-16y-32
= 6y²-4y-32
b. 12+18n-8n-12n²
= -12n²+10n+12
c. 40t-20+12t²-6t
= 12t²+36t-20
d. 4y-6y²-12-18y
= -6y²-14y-12
e. 8t+12t²+10+15t
= 12t²+23t+10
f. 3x²-9xy-2xy+6y²
= 3x²-11xy+6y²

2.a. 16x²-23xy+9y²