Question 126295
{{{(a^2-9)/(18-2a^2)}}}


Start with the fact that {{{-(x-y)=(y-x)}}} and re-write the denominator:


{{{(a^2-9)/(-(2a^2-18))}}}


Now factor a 2 out of the denominator:


{{{(a^2-9)/(-2(a^2-19))}}}


{{{(a^2-9)/(a^2-9)=1}}} so you are left with:


{{{cartoon((a^2-9)/(-2(a^2-19)),cross(a^2-9)/(-2*cross(a^2-19)),green(-1/2))}}}