u^2 - 7u + 1 = 0 \quad \Rightarrow \quad u = rac{7 \pm \sqrt{49 - 4}}{2} = rac{7 \pm \sqrt{45}}{2} = rac{7 \pm 3\sqrt{5}}{2}.

Wed, 06 May 2026 15:10:07 +0000

Content under review