quadratic equation

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The child then knows how to solve a quadratic equation .
于是学生就会解二次方程了。
It is a quadratic equation, so you get two solutions of which one of them is nonphysical, so you can reject that one.
这是一个两次方程，你会得到两个,和物理无关的答案，你可以舍掉那一个。
The quadratic equation may have instilled horror in many of us. But for some 5 to 7 percent of the population even basic math—like the concept of the numbers 5 and 7—causes anxiety.
恐怕有很多人都对二次方程望而生畏吧…可是你知道么，世界上有5%-7%的人面对最基本的算术也会紧张焦虑。

They are going to accompany particles surely as every quadratic equation has two solutions.
他们是成对的粒子,正如每个二次方程都有两个根一样
耶鲁公开课 - 基础物理课程节选
He was trying to describe electrons, but the theory said there are two roots in the quadratic equation and the second root is mathematically as interesting as the first one.
他当时只是想去描述电子,但是数学理论告诉我们,二次方程有两个根,而第二个根在数学上和第一个根一样有趣
耶鲁公开课 - 基础物理课程节选

an equation that includes an unknown value that is multiplied by itself only once, and does not include an unknown value multiplied by itself more than once