Hi

Using the vertex form of a parabola,  where(h,k) is the vertex

f(x)=1/5x^2   Vertex(0,0) Line of symmentry the y a-xis (or x = 0)



Note the Coefficient determines 2 things:

1) whether the parabola opens upward (>0 or downward(<0)

2) the broadness of the parabola

It has NO effect of the axis of symmetry. 

Note: blue graph is:  y = -5x^2



 

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