Question 1039421
{{{x^3+6x^2-27x=x(x^2+6x-27)=x(x-3)(x+9)}}}
{{{x^2+15x+54=(x+6)(x+9)}}}
So,
{{{(x^3+6x^2-27x)/(x^2+15x+54)=(x(x-3)cross((x+9)))/((x+6)cross((x+9)))}}}
{{{(x^3+6x^2-27x)/(x^2+15x+54)=(x(x-3))/(x+6)}}}