题目内容：

高手进,2道英文数学题的翻译
1.Use the quadratic formula to prove that the roots of such an equation must have -a/b as their sum and a/c as their product.
2.Prove that the sum of the squares of the roots of such an equation is a/b-2ac. （Hint）: Consider （r1+r2）. Derive an expression for r1+r2 from this.）

优质解答

1.用二次定理证明对于这个方程式的平方根必须含有-a/b作为它们的和,a/c作为他们的乘积
2.证明这个方程的平方根的平方是a/b-2ac,（提示）：考虑（r1+r2）.从一个关于r1+r2的表达式得出