A Quartet of Quadratics

1. One day my Algebra teacher brought his guitar in and sang the following lines to a tune I've mostly forgotten, though I do remember the words:
When you encounter a quadratic equation

In a difficult situation,

Remember this and you can't go wrong;

The quadratic formula's not too long.

X equals negative B

Plus or minus the square root of B squared minus 4 A C

All over 2 A (bum bum)

Remember this and you can't go wrong;

The quadratic formula's not too long.

2. I thought of this because last week in class, my friend the Math teacher told this story:
Once there was a bee. An unusual bee. A very sour, bitter, negative bee. He was flying up and down, up and down, minding his own business, when he flew smack into a square root. He looked inside the root, and he saw another bee, but this bee was unusual too -- it was a square bee. And the square bee was pulling four apple carts. And the whole thing was balanced on two apples.

3. And then during a meeting of the literary magazine staff this afternoon, one of my students got up and sang the following with accompanying hand motions, to the tune of "Yellow Submarine":
Negative B

Plus or minus

The square root of

B squared

Minus four

A times C

All over

Two A (bum bum bum)

We all know the quadratic formula,

Quadratic formula,

Quadratic formula.

We all know the quadratic formula,

Quadratic formula,

Quadratic formula!

4. After all that, if you still can't remember it, I guess you need to follow this guy.