2 x + 6*x + 8
x^2 + 6*x + 8
(x + 4)*(x + 2)
2 8 + x + 6*x
8 + x^2 + 6*x
(2 + x)*(4 + x)
8.0 + x^2 + 6.0*x
8 + x*(6 + x)