N1
18ca^3 - 12a^2 c^2 + 2ac^3 = 2ac(9a^2 - 6ac + c^2) = 2ac(3a - c)^2
N2
-x^2 + 2 = x + 2
-x^2 +2 - x - 2 = 0
-x^2 - x = 0
x^2 + x = 0
x(x + 1) = 0
x = 0; x = -1
N1
18ca^3 - 12a^2 c^2 + 2ac^3 = 2ac(9a^2 - 6ac + c^2) = 2ac(3a - c)^2
N2
-x^2 + 2 = x + 2
-x^2 +2 - x - 2 = 0
-x^2 - x = 0
x^2 + x = 0
x(x + 1) = 0
x = 0; x = -1