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How to write an equation for a parabola in vertex form (answer)

Some examples for the formula   The format of the equation that shows you where the vertex is   y = a(x - h)2 + k   Example.  This parabola has a vertex at (3,4).   y = 2(x - 3)2 + 4   Example 2.  This parabola has...

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What is an one-to-one function? (answer)

One to one   If you can draw a horizontal line that crosses the graph in more than one place, then the function is NOT one to one.  For example, a parabola is a u-shaped graph.  You can cross the graph in two places.  Any straight line is a one to one graph.