identify the characteristics of the quadratic function and its graph.

y=x²+4x+4

the vertex is ___. the axis of symmetry is x=___. the domain is all real numbers. the range is ≥ ___. the function is ___ when x < ___. and ___ when x > ___. the y-intercept is ___. the x-intercept is ___. the function is positive when x < ___ and x > ____. y-> ____ as x -> - ∞ and y -> ___ as x -> ___.