Answer:
All real numbers less than or equal to 7
Step-by-step explanation:
we have
f(x)=-(x+3)^2+7
we know that
The function is a vertical parabola open downward
The vertex is the point ( -3,7 )
The vertex is a maximum
The range is the interval-----------> (-∞,7]
That means
All real numbers less than or equal to
