lean_workbook_plus_34385

Proved

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

Solve for all real and imaginary: $x^{4}+5x^{3}-3x^{2}-17x-10=0$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_34385 (x : ℂ) : x^4 + 5*x^3 - 3*x^2 - 17*x - 10 = 0 ↔ x = 2 ∨ x = -1 ∨ x = -1 ∨ x = -5   :=  by sorry

Source