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What is the most useless thing you still have memorized?
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X equals negative B
Plus or minus the square root
Of B squared minus 4AC
All over 2A
Sang to the tune of pop goes the weasel.
I haven’t done pre-calc in like 10 years, but this song still lives rent free in my head.
I learned similarly but to the tune of the Flintstones theme.
"Neg B / Plus or minus / Square root of b squared minus 4AC / It's all / Over 2A / That's the quadratic formul-ee" (to rhyme with 4AC).
You can also do it to the chorus of Rollin' in the Deep. I teach both to my Algebra students.