quadratic equation

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The child then knows how to solve a quadratic equation .
於是學生就會解二次方程了。
It is a quadratic equation, so you get two solutions of which one of them is nonphysical, so you can reject that one.
這是一個兩次方程，你會得到兩個,和物理無關的答案，你可以捨掉那一個。
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.
恐怕有很多人都對二次方程望而生畏吧…可是你知道麽，世界上有5%-7%的人麪對最基本的算術也會緊張焦慮。

They are going to accompany particles surely as every quadratic equation has two solutions.
他們是成對的粒子,正如每個二次方程都有兩個根一樣
耶魯公開課 - 基礎物理課程節選
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.
他儅時衹是想去描述電子,但是數學理論告訴我們,二次方程有兩個根,而第二個根在數學上和第一個根一樣有趣
耶魯公開課 - 基礎物理課程節選

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