lean_workbook_plus_24898

Proved

by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

For what values of $x$ is $2x^2+8x\le-6$ ? Express your answer in interval notation.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_24898 (x : ℝ) : 2 * x ^ 2 + 8 * x ≤ -6 ↔ -3 ≤ x ∧ x ≤ -1   :=  by sorry

Source