Chen Bartlett
05/27/2023 · Middle School

The domain of the function \( f: f(x)=\left\{\begin{array}{lll}x^{2}+2 & ,-2 \leq x<0 \\ x-1 & , \quad x>0\end{array}\right. \) \( \begin{array}{llll}\text { a) } \mathbb{R} & \text { (b) }[-2,0[ & \text { (c) }[-2, \infty[-\{0\} & \text { (d) }[-2, \infty\end{array} \)

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要解决这个问题,我们需要确定函数 \( f(x) \) 的定义域。函数 \( f(x) \) 是一个分段函数,定义如下: \[ f(x) = \begin{cases} x^2 + 2 & \text{if } -2 \leq x < 0 \\ x - 1 & \text{if } x > 0 \end{cases} \] 我们需要分别考虑两个分段: 1. 当 \( -2 \leq x < 0 \) 时,函数 \( f(x) = x^2 + 2 \)。 2. 当 \( x > 0 \) 时,函数 \( f(x) = x - 1 \)。 ### 第一步:确定每个分段的定义域 - 对于第一个分段 \( -2 \leq x < 0 \),定义域是闭区间 \([-2, 0)\)。 - 对于第二个分段 \( x > 0 \),定义域是开区间 \((0, \infty)\)。 ### 第二步:合并两个分段的定义域 将两个分段的定义域合并,我们得到: \[ [-2, 0) \cup (0, \infty) \] ### 第三步:化简合并后的定义域 合并后的定义域可以表示为: \[ [-2, \infty) \setminus \{0\} \] ### 第四步:选择正确的选项 根据以上分析,函数 \( f(x) \) 的定义域是 \( [-2, \infty) \setminus \{0\} \),对应选项 (c)。 因此,正确答案是: \[ \text{(c) } [-2, \infty) \setminus \{0\} \]

Quick Answer

The domain of the function is \( [-2, \infty) \setminus \{0\} \). Therefore, the correct answer is (c).
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