g) 8x3 - 27y3
= (2x)3 - (3y)3
= (2x - 3y).(4x2 + 6xy + 9y2)
h) x3 + y3 + 2x2 - 2xy + 2y2
= (x3 + y3) + (2x2 - 2xy + 2y2)
= (x + y).(x2 - xy + y2) + 2.(x2 - xy + y2)
= (x2 - xy + y2).(x + y + 2)
g: \(=\left(2x-3y\right)\left(4x^2+6xy+9y^2\right)\)
h:\(=\left(x+y\right)\left(x^2-xy+y^2\right)+2\left(x^2-xy+y^2\right)\)
\(=\left(x^2-xy+y^2\right)\left(x+y+2\right)\)