Tag Archives: Quadratic equation

The importance of committing facts to memory

19 May

In an article in last week’s New York Times, we find this:

The director of Google’s education apps group, Jonathan Rochelle, touched on that idea in a speech at an industry conference last year. Referring to his own children, he said: “I cannot answer for them what they are going to do with the quadratic equation. I don’t know why they are learning it.” He added, “And I don’t know why they can’t ask Google for the answer if the answer is right there.”

Regular readers know that I think this fundamentally misguided. Knowledge remains and will remain essential to negotiating the world. To see why let’s turn to another article in the Times: “If Americans Can Find North Korea on a Map, They’re More Likely to Prefer Diplomacy.”

Here’s the map of where the surveyed individuals placed North Korea.

nkorea map

According to the Times:

Geographic knowledge itself may contribute to an increased appreciation of the complexity of geopolitical events.

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

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:


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