ANSWER
The graph of the function opens down and has a maximum value.
EXPLANATION.
The given function is,

This is a quadratic function or a parabola with,

Since the value of

is less than zero, the graph opens downwards.
The vertex of this graph is the maximum point this graph.
The y-value of the vertex is the maximum value.
Hence the graph is a maximum graph.
The graph of the function,

, opens (down) and has a (max) value.