I have a math question

[marciosmg]

zexen_lowe said:

dtewi said:
So the vertex is the point where the parabola becomes symmetrical over the x-axis?

The vertex is the minimum point (if the parabole is concave to the upside, or "happy"), or the maximum point (if the parabole is concave to the downside, or "sad"). In your example, 0,0

 

Happy and sad, LOL. What do we do, in order to memoryze it

 

remember, if it is "happy", a>0. If "sad", a<0.