Formula for solving quadratic equations

How to remember the formula to solve quadratic equations: (Taught by Cikgu Lo Fui Shu)

It's a double-story house. On the second floor, there is a balcony.

First, you need a railing, in case someone falls out. (The negative sign)

Second, is the baby (Unknown b)

Then there's the window. (Plus-Minus sign)

Then the roof. (Square root)

Inside is another baby. (Unknown b)

With the musical thingy above it. (Square)

And then another railing, to keep the baby from running around. (Negative sign)

Beside the baby are 4 (Number 4) Ah Ma's (Unknown a)

Who 'see' (Unknown c) over the baby.

On the first floor are another 2 (Number 2) Ah Ma's (Unknown a).

Conclusion?

Six very lazy Ah Ma's who imprison babies inside railings and a very rich family that can afford 6 lazy Ah Ma's.