Quadratic formula mnemonic

17 Sep


Going through some of my notes I rediscovered this mnemonic for the quadratic formula:

From square of b, take 4ac;
Square root extract, and b subtract;
Divide by 2a; you’ve x, hooray!

I am not sure of the origins of this mnemonic. The earliest version I could find was from J. S. Mackay in 1894, but he says the mnemonic was given to him by a member of the Edinburgh Mathematical Society.

Here’s another mnemonic for the quadratic formula:




And let’s not forget the Quadratic Formula Rap:


3 Responses to “Quadratic formula mnemonic”

  1. askunda June 18, 2018 at 6:39 pm #

    The negative Boy (-B) couldnt decide (+/-) if he wanted to go to the rad (√) party. Becuase he was square, (B^2), he missed out (-) on 4 Awesome Chicks. (4 (a)(c). It was all over at 2 AM. -B+/-√B^2-4(a)(c)


  1. How to memorize a formula | peakmemory - September 18, 2014

    […] Yesterday, I blogged about a mnemonic for learning the quadratic equation. Here is an excellent video that teaches a general mnemonic technique for formula memorization: […]

  2. The importance of committing facts to memory | peakmemory - May 19, 2017

    […] By the way the quadratic equation is not that hard to learn. […]

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