Using the tune of Twinkle Twinkle Little Star:

x equals to negative b
plus or minus, the square root of
B square minus four A C
all of which is over two A.

Now I know how-to find my roots,
next time you can find them too!

$x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}$

My dad thought up of this ingenious way to remember the roots of the quadratic formula and taught it to all of his students including me. So while my peers were struggling with trying to remember if it was $b^2-4ac$ or $b^2+4ac$, I was quietly singing Twinkle Twinkle Little Star to myself.

I imagine that must have been quite unsettling during a math test, hearing someone singing a soft lullaby.

But it works fantastically well. So I thought it would be nice to share it here.