X2 + 4xx(x + 4)=======
X3 + 8= (x+2)(x2-2x+4)
x2-196 = (x-14)(x+14) when factored
(x2 + 1) = (x2 - i2) with the factors (x+i)(x-i) where i is the square root of (-1).If you don't allow complex numbers (which is usually the case in school mathematics) then there is no factorisation.
X2 - 4= (x + 2)(x - 2)===========
X2 + 4xx(x + 4)=======
x2 + 6x = x*(x + 6)
4(x2 + 4)
x(x+5)
(x+5)(x+3)
(x-7)(x-3)
(x + 11)(x - 4)
(x-5)(x+11)
x2 + 4x = x(x + 4)
1(x2-1)
X3 + 8= (x+2)(x2-2x+4)
x3+xy-x2y2=x(x2+y-xy2)