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Quadratic formula mnemonic

17 Sep

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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:

 

Tales from my library: Raymond Smullyan

2 May

The books of philosopher, mathematician, magician, musician, Raymond Smullyan are priceless. If you are not familiar with his work, his autobiography is good place to start.

 

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I own many books by Smullyan. Including these:

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I have also been working through his book  Set Theory and the Continuum Problem

 

 

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Arthur Benjamin on math education

2 Apr

The amazing Arthur Benjamin makes the argument that statistics, not calculus, should be the goal of mathematics education.

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