Graphing Linear, Quadratic, and Exponential Models* Quadratics

Axis of symmetry and vertex

What does this mistake reveal about the kid’s thinking? How would you take the kid’s thinking to the next level?

One reply on “Axis of symmetry and vertex”

I’m not sure that there’s any serious misunderstanding, other than that x comes before y. I know that many people tell students to find the axis of symmetry by finding the value halfway between the x intercepts, in which case y=0. So the student does need to know that an axis is a line. The student was able to find the vertex, even though s/he put x and y backwards.

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