What is the range of the reciprocal function of $f(x) = 10 - x^2$? $\{y \in \mathbb{R} | y \ge \frac{1}{10}\}$ $\{y \in \mathbb{R} | y \ge 10\}$ $\{y \in \mathbb{R} | \frac{1}{10} \le y < 0\}$ $\{y \in \mathbb{R} | y < 0 \text{ or } y \ge \frac{1}{10}\}$
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Since $x^2 \ge 0$, the maximum value of $f(x)$ is 10 when $x = 0$, and $f(x)$ can take any value less than or equal to 10. Therefore, the range of $f(x)$ is $(-\infty, 10]$. Show more…
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