lean_workbook_plus_54225

Proved

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

For what values of $x$ is it true that $x^2 - 5x - 4 \le 10$ ? Express your answer in interval notation.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_54225 (x : ℝ) : x^2 - 5*x - 4 ≤ 10 ↔ -2 ≤ x ∧ x ≤ 7   :=  by sorry

Source