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简化 x2 + 4x + 4 = 4x + 4 重新排序条件: 4 + 4x + x2 = 4x + 4 重新排序条件: 4 + 4x + x2 = 4 + 4x 增加 '-4' 到方程的每一侧. 4 + 4x + -4 + x2 = 4 + -4 + 4x 重新排序条件: 4 + -4 + 4x + x2 = 4 + -4 + 4x 结合相似条件: 4 + -4 = 0 0 + 4x + x2 = 4 + -4 + 4x 4x + x2 = 4 + -4 + 4x 结合相似条件: 4 + -4 = 0 4x + x2 = 0 + 4x 4x + x2 = 4x 增加 '-4x' 到方程的每一侧. 4x + -4x + x2 = 4x + -4x 结合相似条件: 4x + -4x = 0 0 + x2 = 4x + -4x x2 = 4x + -4x 结合相似条件: 4x + -4x = 0 x2 = 0 解: x2 = 0 求解变量 'x'. 移动所有含x 的放右边,所有其它条件放左边. 简化 x2 = 0 取每边的平方根: x = {0}
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