15+ Interval Notation Graph Parabola Background. The key is to concentrate for instance, if you have a parabola that is facing down with a vertex at (2,8), then the 2 is going to be what you use in the interval notation in terms of. Square brackets in interval notation denote inclusive boundaries.
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The risk of using the graph to find the range is that you could potentially misread the critical points in the graph and give an inaccurate evaluation of the where the function reaches its maximum or minimum. We use interval notation to represent subsets of real numbers. Square brackets in interval notation denote inclusive boundaries. Parabolas are also symmetrical which means they can be folded along a line so that all of the points on one side of the fold line.
