Jay Cummings

🧵 My 3rd book is now out! It is on the fascinating history of math.

How did people throughout history think about math?What problems did they care about? How did they express them? How were they solved?

This book includes a lot of historical math.

a.co/d/gsoNKxP

My friend sent me this great problem:

A random card is drawn from a deck, which you will try to guess. But first, you can ask 1 yes/no question.

Is it better to ask if the card is red or if the card is the ace of spades?

The quadratic formula gives the solutions to the quadratic equation, ax² + bx + c = 0.

In my math history class today, we talked about how there is also a formula for the solutions to the *quartic* equation, ax⁴ + bx³ + cx² + dx + e = 0.

But... it's a bit more complicated. Turn your sound up and enjoy:

To my American followers: I hope you vote today!

This must be tweeted every Halloween I don’t make the rules