Cute graphics but these owls aren’t going to help you remember the quadratic formula itself, just the format.
Instead of x=
-b ± SQRT(b^2-4ac)
which would require three owls - a, b, and c, this shirt has five different owls :-<
Actually, if you look closely at the markings on the owls’ chests, they are little a’s, b’s, and c’s.