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GeoGebra

Find Stretch to Match a Point

Author:Matthew Kushner

What value of "a" will make the graph pass through the point (-3,4)

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This quadratic is y = a(x + 4)(x - 2). How can you obtain the (x + 4) and (x - 2) from the graph?

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Play with the vertical stretch and observe the x intercepts. Does changing the stretch "a" change the x intercepts?

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What is the axis of symmetry?

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