Match $\{x : x ext{ is an integer and } x^{2} - 9 = 0\}$ with its ro…

Question

Match $\{x : x 	ext{ is an integer and } x^{2} - 9 = 0\}$ with its roster form.

Accepted Answer

B. $\{-3, 3\}$

$x^{2} - 9 = 0 \Rightarrow x^{2} = 9 \Rightarrow x = \pm 3$. Both $\pm 3$ are integers.
- **A** drops the negative root.
- **C** picks roots of $x^2 - 81 = 0$.
- **D** would apply if no integers satisfied the equation.

Answer

$\{3\}$

Answer

$\{9, -9\}$

Answer

$\phi$

Match $\{x : x \text{ is an integer and } x^{2} - 9 = 0\}$ with its roster form.