Q. Simplify:$\displaystyle \frac {a^2 - b^2 + a - b}{a^2 - 4ab + 3b^2} \times \frac {a^2 - 3ab}{a + b + 1}$

this is the furthest i've gotten, im not sure if its even right so far

$\displaystyle \frac {(a + b)(a - b) + (a - b)}{a^2 - 4ab + 3b^2} \times \frac {a(a - 3b)}{a + b + 1}$

Thanks