例如，为了使用二次方程式，你需要知道标准的二次平方式。
For instance, in order to use the quadratic formula you must have the quadratic in standard form first.
这是一个x的二次方程，也是一个抛物线方程式,抛物线都长这样。
It's a second-order equation in x, and is a parabola and a parabola has this shape.
这是一个x的二次方程，也是一个抛物线方程式,抛物线都长这样。
It's a second-order equation in x, and is a parabola and a parabola has this shape.
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