Question 803219
It looks like {{{ x = -1 }}} would be at the
vertex of the parabola because if I go equally in 
the (+) and (-) directions from {{{ x = -1 }}},
I get the same {{{ f(x) }}}
{{{ x = -2 }}}
{{{ f(x) = 2 }}}
and
{{{ x = 0 }}}
{{{ f(x) = 2 }}}
------------
{{{ x = -3 }}}
{{{ f(x) = 8 }}}
and
{{{ x = 1 }}}
{{{ f(x) = 8 }}}
------------
etc.
So, the vertex is at {{{ x = -1 }}}, {{{ f(x) = 0 }}}
Here's the plot:
{{{ graph( 400, 400, -5, 5, -5, 5, 2*( x+1 )^2 ) }}}