\[(x - 1,6)^{2} - 2,25 = 0\]
\[(x - 1,6)^{2} = 2,25\]
\[(x - 1,6)^{2} = {1,5}^{2}\]
\[x - 1,6 = 1,5\]
\[x = 3,1;\]
\[x - 1,6 = - 1,5\]
\[x = 0,1.\]
\[Ответ:0,1;\ \ 3,1.\]