Appendix A - Review - A.10 Internal Notation; Solving Inequalities - A.10 Assess Your Understanding - Page A87: 12

Interval Notation: $(-1,2)$ Inequality Form: $-1\lt x\lt 2$

Since the bracket notations are open (because of the use of parentheses) at $-1$ and $2$, then the interval is $(-1,2)$. In terms of inequality, we have $-1\lt x\lt 2$.