\begin{align*}y=-(x-5)^2+k\end{align*}

In the parabola equation above, k is a constant. When the parabola is graphed in the xy-plane, its vertex is at (5,16). If the parabola crosses the x-axis at x=a and x=b, what is the value of a+b ?

A)
B)
C)
D)

 


     

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