Question

Solve for
u
u^2-3u-4=0

Answer 1

\[u ^{2} -3u -4 = 0\]
\[u ^{2} -4u + 1u - 4 = 0\]
\[u (u - 4)+ 1 ( u - 4) = 0\]
\[(u + 1) (u - 4) = 0\]
therefore, \[u = -1
u = +4\]