## Precalculus: Mathematics for Calculus, 7th Edition

The solution is $\Big(-\infty,-\dfrac{1}{2}\Big)$
$2x+1\lt0$ Take the $1$ to the right side of the inequality: $2x\lt-1$ Take the $2$ to divide the right side: $x\lt-\dfrac{1}{2}$ Express using interval notation: The solution is $\Big(-\infty,-\dfrac{1}{2}\Big)$