(x - 10)*(x - 9)
(x - 1*10)*(x - 1*9)
1*(x - 9)*(x - 10)
(1*(x - 9))*(x - 10)
(-10.0 + x)*(-9.0 + x)
2 90 + x - 19*x
90 + x^2 - 19*x