Chapter 1 - 1.2 - Linear Equations in One Variable - 1.2 Exercises - Page 89: 79d

$1.8$ and $1.9$

Since the function is strictly monotonically increasing and the interval which contains $0$ is the one that is between $1.8$ and $1.9$, this is the interval we are looking for. We can always partition the interval that contains the desired solution until we have the desired precision.