Posts Tagged ‘mind=blown’


Posted: October 30, 2015 in Uncategorized
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stretch example

mindblownOne of my students posted this example of a vertical stretch and wrote the words “wider and taller”…and I said, “wait a sec!”

Usually a vertical stretch makes the graph look taller and “thinner”; but, when I thought about this, it seems that we usually look at graphs where the curves face inward (toward the axis of symmetry or some other center-ish axis).  I  am thinking of a parabola,  a cubic, or a sinusoidal function.  Here however, the curves open away from the center and thus the vertical stretch gets wider.