lean_workbook_plus_11118

Proved

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

$(x-1)^{2}+x^{2}+(x+1)^{2}=3x^{2}+2$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_11118 (x : ℝ) : (x-1)^2 + x^2 + (x+1)^2 = 3*x^2 + 2   :=  by sorry

Source