2 x + 7*x + 10
x^2 + 7*x + 10
2 10 + x + 7*x
10 + x^2 + 7*x
(x + 5)*(x + 2)
10.0 + x^2 + 7.0*x
10 + x*(7 + x)
(2 + x)*(5 + x)