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You know three points that lie on the parabola. So they tell you three pairs of values of and . So plug these into this equation, and you get:
So the equation becomes .
Then the other two points:
Substitute into (1):
So there's your equation:
The x intercepts are the values of x where the curve crosses the x-axis. They are 0 and 630. So if we assume that the x-axis represents the ground, and the units are measured in feet (which I don't know for sure - I'm only guessing!), this means that the arch is 630 feet wide at its base.My x intercepts and what it means in the context of the situation
The y-intercept is the value of y at the point where the curve crosses the y-axis, which is zero. Again, if the x-axis represents the ground, this means that the height of the arch above the ground at any point is given by the value of y, and the highest point will be at (315, 630) - so it's 630 feet high.My y intercepts and what it means in the context of the situation
The domain is the set of values of x that you will need to use in the problem, and the range is the set of values of y. In each case, then, these are numbers from 0 to 630.The practical domain/range