lean_workbook_plus_41740

Proved

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

Find $a$ such that $f(0) = a^2 - 2a + 2 = 11$ in case 1.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_41740 (a : ℝ) (h₁ : a^2 - 2*a + 2 = 11) : a = 1 - Real.sqrt 10 ∨ a = 1 + Real.sqrt 10   :=  by sorry

Source