X^2 + 2 = X + 2
X^2 = X
X = 0
X = 1
A-2b+c=1.3-2(-0.6)-3.5=1,3+1,2-3,5=2,5-3,5=-1
(a-6)(a+5)(a-1)-(a^2-2a)(a+1) = (a^2 - 6a + 5a - 30)(a-1) - (a^3 - 2a^2 + a^2 -2a) =
=(a^2 - a - 30)(a-1)-(a^3- a^2 -2a)=a^3 - a^2 -30a - a^2 + a + 30 -a^3 + a^2 + 2a =
= -a^2 - 27a + 30
1)a³+b³-ab(a+b)=(a+b)(a²-ab+b²)-ab(a+b)=(a+b)(a²-ab+b²-ab)=
=(a+b)(a²-2ab+b²)=(a+b)(a-b)(a-b)=(a+b)(a-b)²
2)x³-y³-3xy(x-y)=(x-y)(x²+xy+y²)-3xy(x-y)=(x-y)(x²+xy+y²-3xy)=
=(x-y)(x²-2xy+y²)=(x-y)(x-y)(x-y)=(x-y)³