Question 59373
Here we dont know if x is a maximum or a minimum, or even if it is a right triangle.
We must work this twice.
{{{ x + 8 = 12 }}} and {{{ x = 8 + 12 }}}
{{{ x = 4 }}} and {{{ x = 20 }}}
THEREFORE
{{{ 4<= x <= 20 }}}