Question 389416
Solve:
{{{-3u = u^2}}} Expand the right side.
{{{-3u = u*u}}} Now divide both sides by u.
{{{-3u/u = u*u/u}}} Now you can see that you can cancel the u's on both sides to get:
{{{-3 = u}}}
Check:
{{{-3u = u^2}}} Substitute {{{u = -3}}}
{{{(-3)(-3) = (-3)^2}}}
{{{9 = 9}}} OK!