1.
a) 4a^2-4a+1
b) x^2+6y+9y^2
c) 49-x^2
2.
a) x^2+10x+25-10x+5x^2=6x^2+25
b) 16y+2(y^2-8y+16)=16y+2y^2-16y+32=2y^2+32
3.
a)(9-a)(9+a)
b)5(x^2-y^2)
c)(√3x-√2x) (в квадрате)
4.
a^4+8a^3+16a^2-a^4+4a^2-8a^3+4a^2=24a^2
5.
a) прости , не знаю
b) (a+1/2y)(a^2-1/2ya+ 1/4y)
c) (9y^4-x^2)(9y^4+x^2)
d) a(1-a)+b(1+b)=(1+b-a-ab)(a+b)