\[\boxed{\text{415\ (415).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = \sqrt{2x - 1 - x^{2}} - 1\]
\[y = \sqrt{- \left( x^{2} - 2x + 1 \right)} - 1\]
\[y = \sqrt{- (x - 1)^{2}} - 1\]
\[- (x - 1)^{2} \geq 0\]
\[(x - 1)^{2} \leq 0\]
\[x - 1 = 0\]
\[x = 1 - единственное\ \]
\[решение;\]
\[y = - 1.\]
\[График\ функции\ y =\]
\[= \sqrt{2x - 1 - x^{2}} -\]
\[- 1 - точка\ (1; - 1).\]