📐数学Medium1234 已解答

Solve Quadratic Equations

Learn how to solve quadratic equations using different methods including factoring, completing the square, and the quadratic formula.

题目

Solve the quadratic equation: x² + 5x + 6 = 0

分步解答

1

识别二次方程的标准形式

标准形式为 ax² + bx + c = 0,其中: - a = 1 - b = 5 - c = 6
2

使用因式分解法

寻找两个数字 p 和 q,使得: - p + q = b = 5 - p × q = c = 6 这两个数字是 2 和 3
3

写出因式分解形式

x² + 5x + 6 = (x + 2)(x + 3) = 0
4

求解 x 的值

根据零因子定理: - x + 2 = 0 或 x + 3 = 0 - x = -2 或 x = -3 因此,解为 x = -2 或 x = -3