The quadratic equation may have instilled horror in many of us .

我们很多人可能面对二次方程式会感到恐惧。

Both vegetables and quadratic polynomials are made more interesting with the mandelbrot set .

有了曼德尔勃特集合，蔬菜和二次多项式都变得有趣多了。

Readers who were paying attention in their maths classes may recall that quadratic equations often have two solutions , one positive and one negative .

数学课上认真听讲的读者朋友或许都能想起二次方程式通常有两个解：一个是正解，另一个是负解。