Question

resolva a inequação modular: |3x + 4| ≤ 0​

Answer 1

$\boxed{\begin{array}{l}\sf |x|\leqslant a\Longleftrightarrow -a\leqslant x\leqslant a\\\sf |3x+4|\leqslant0\\\sf 3x+4\leqslant0\\\sf 3x\leqslant-4\\\sf x\leqslant -\dfrac{4}{3}\\\sf S=\{x\in\mathbb{R}/x\leqslant-\dfrac{4}{3}\}\end{array}}$