A. (a+3)*2+(a+4)*2 B. (3y-2)*2-(y-6)*2

A. (a+3)² + (a+4)²
= (a²+3a+3a+9) + (a²+4a+4a+16)
= a²+6a+9+a²+8a+16
= 2a²+14a+25

B. (3y-2)² - (y-6)²
= (9y²-6y-6y+4) - (y²-6y-6y+36)
= (9y²-12y+4) - (y²-12y+36)
= 9y²-12y+4-y²+12y-36
= 8y²-32

maaf jika ada kesalahan :)