How do you find the max or min of a function?

If parabolas open down, then their vertices are at a maximum point, whereas if parabolas open up, their vertices are at a minimum point.

I hope this was the answer you were looking for, and as always, I am joyous to assist anyone at any time.

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's