Such as the email I sent yesterday was related to quadratic equation.

比如我昨天发邮件是关于一个二次方程问题。

(Laughter) finding imaginary solutions to quadratic equations.

（声）寻找二次方程虚解。

And you may even have learned a little bit about the quadratic equation.

您甚至可能对二次方程有所了解。

And because of the way the quadratic formula works, we'll get 2 possible answers.

由于二次公工作方， 我们将得到 2 个可能答案。

And we end up with this. Which you probably recognize as a quadratic equation.

我们最终得到了这个。 你可能认为这是一个二次方程。

Which you probably recognize as a quadratic equation.

你可能认为这是一个二次方程。

(bell rings) - So that's our refresher on the quadratic formula.

（铃响）- 这就是我们对二次公习。

As if my fellow mathlete here would have any questions about the quadratic formula.

- 好像我数学家同学会对二次公有任何疑问。

Not even a quadratic basis to work with here.

甚至找不出两个相同动作。

Thing, e to the minus quadratic form, is Gaussian.

事物, e 到负二次形, 是高斯。

To solve the quadratic equation we have to use the quadratic formula.

要求解二次方程， 我们必须使用二次公。

I guess you could call that simplifying, but ugh...that's like quadratic, I don't want to do that.

我想你可以称之为简化， 但是呃. . . . .

For example, the very first lesson is going to be on a simpler version of the quadratic formula.

例如，第一课将是关于二次公简单版本。

Well, it turns out this is e to the minus mu squared, some quadratic form.

嗯，事实证明这是 e 到负 mu 平方，某种二次形。

Anytime you ever see a distribution and it's e to the minus, some quadratic form, that's Gaussian distribution.

任何时候你看到一个分布， 它是 e 到负，一些二次形， 那就是高斯分布。

So the quadratic term is multiplied by the inverse variance.

因此, 二次项乘以逆方差。

Of mu given x bar is equal to quadratic terms multiplier inverted.

mu 给定 x bar 等于倒置二次项乘数。

You know how in order to find the two roots of a quadratic equation, everyone learns a certain formula in school?

你知道为了找到二次方程两个根，每个人在学校都会学习某个公吗？

That question about the plots of land can be written as one of the first equations with unknowns you probably ever heard of, the quadratic equation.

关于土地问题可以写成最早未知数方程之一，你可能听说过，二次方程。

I was able to reduce what I had to find from an eighth-degree polynomial to a quadratic, and from the quadratic, the golden ratio fell out.

我可以把我答案从八次方多项简化成二次方程，然后从二次方程中得出黄金分割率。