How much water does it take to completely fill a small pool that is 10 feet long, 20 feet wide and 10 feet deep?
2 answers:
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You would best do this by completing the square on the quadratic and subbing in the vertex they give you, like this:
Since the y coordinate of the vertex is 1/2 and we need to solve for c, set the
equal to 1/2 and solve for c, which is the whole point of what we are doing, right?
and 
and c = 4. So that's our answer!
Since the y coordinate of the vertex is 1/2 and we need to solve for c, set the