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(a^2-1)+1-a^2 <---- postać sumy.
a^2-1+1-a^2=0
b) -(a^2-3)-(2a+3)
-a^2+3-2a-3=-a^2-2a
c) (a-3)^2-(a-3)(a+3)=(a-3)^2-a^2-9=a^2-6a+9-a^2-9=-6a
d)(1+x)^2+(1-x)^2-(1+x)*(x+1)=(1+2x+x^2)+(1-2x+x^2)-2x+1+x^2=1+2x+x^2+1-2x+x^2-2x+1+x^2=3x^2-2x+3
2.a)
3a-6ab
3(a-2ab)
b) 3x^2-x-->1(3x^2-x)
c) a^2+2ab-->a(a+2b)
d) 4x^2 - y^2--> (2x+y)(2x-y)
e) 16x^2-32x=16x(x-2)
f) 2x^3 +2x-2x^2=2(x^3+x-x^2)
g)2+2a+1=2a+3