Question 845134
{{{ 2x^2 - 8 = 0 }}}
{{{ x = ( -b +- sqrt( b^2 - 4*a*c )) / (2*a) }}} 
{{{ a = 2 }}}
{{{ b = 0 }}}
{{{ c = -8 }}}
{{{ x = ( -0 +- sqrt( 0^2 - 4*2*(-8) )) / (2*2) }}} 
{{{ x = ( -0 +- sqrt( 64 )) / 4 }}} 
{{{ x = 8/4 }}} 
{{{ x = 2 }}}
and, also:
{{{ x = -8/4 }}}
{{{ x = -2 }}}
Here's a plot showing roots {{{ x = 2 }}}, and {{{ x = -2 }}}
{{{ graph( 400, 400, -5, 5, -10, 5, 2x^2 - 8 ) }}}