2 x + 6*x - 10
x^2 + 6*x - 10
/ ____\ / ____\ \x + 3 - \/ 19 /*\x + 3 + \/ 19 /
(x + 3 - sqrt(19))*(x + 3 + sqrt(19))
2 -10 + x + 6*x
-10 + x^2 + 6*x
-10 + x*(6 + x)
-10.0 + x^2 + 6.0*x