2 x + 6*x + 10
x^2 + 6*x + 10
(x + 3 + I)*(x + 3 - I)
(x + 3 + i)*(x + 3 - i)
2 10 + x + 6*x
10 + x^2 + 6*x
10 + x*(6 + x)
10.0 + x^2 + 6.0*x