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我们知道,一元二次方程的根与系数之间存在下列关系:如果关于x的一元二次方程ax2+bx+c=0(a≠0)的两个实数根是x1,x2,那么x1+x2=-b/a,x1·x2=ca.利用这一关系,可以解答与一元二次方程有关的一些问题.
We know that there is the following relationship between roots and coefficients of a quadratic equation: If the two real roots of the univariate quadratic equation ax2 + bx + c = 0 (a ≠ 0) for x are x1, x2 then x1 + x2 = -b / a, x1 · x2 = ca. Using this relationship, we can answer some questions about the quadratic equation.