7x^2+45x+18 = (7x+3)(x+6)
x^3+12x^2+36x = x(x+6)^2
so, dividing, you are left with
(7x+3)/x(x+6)^2 can be simplified to
(7x+3)/(x^2+6x)^2 which can be simplified to...
Cass -10th Geometry -
what is the area of 32cm