Question 203065
{{{((n^2+5n+6)/(n^2+7n+12))*((n^2+9n+20)/(n^2+11n+30))}}}
Factor the trinomials in the numerators and the denominators.
{{{((n+2)cross((n+3))/cross((n+3))cross((n+4)))*(cross((n+5))cross((n+4))/(n+6)cross((n+5)))}}} Now cancel the common factors as shown to leave you with:
{{{highlight((n+2)/(n+6))}}}