Question:
A parabola $ax^2+bx+c$ contains the points $(-1,0)$, $(0,5)$, and $(5,0)$.  Find the value $100a+10b+c$.

Answer:
Since the points $(-1,0)$ and $(5,0)$ have the same $y$-value, the axis of symmetry of the parabola must be between these 2 points.  The $x$-value halfway between $-1$ and $5$ is $x=2$.  Therefore the vertex of the parabola is equal to $(2,k)$ for some $k$ and the parabola may also be written as  \[a(x-2)^2+k.\] Now we substitute.  The point $(5,0)$ gives  \[0=a(5-2)^2+k,\] or  \[9a+k=0.\] The point $(0,5)$ gives  \[5=a(0-2)^2+k\] or  \[4a+k=5.\] Subtracting the second equation from the first gives  \[(9a+k)-(4a+k)=0-5\] so $5a=-5$, giving $a=-1$.

Since $a=-1$ and $9a+k=0$ we know that $k=9$ and our parabola is  \[ax^2+bx+c=-(x-2)^2+9.\] In order to compute $100a+10b+c$ we can substitute $x=10$ and that gives  \[100a+10b+c=-(10-2)^2+9=\boxed{-55}.\]