\[u = |v| - 8\]
\[v = - 25:\]
\[u = | - 25| - 8 = 25 - 8 = 17.\]
\[v = 0:\]
\[u = |0| - 8 = 0 - 8 = - 8.\]
\[v = 4:\]
\[u = |4| - 8 = 4 - 8 = - 4.\]