Graph the Quadratic 

Lots of practice 🤣

Yes. Completing the square is usually the bedrock of quadratic equations, but it is typically avoided because factoring is way easier; and when factoring proves difficult, then the Quadratic Formula is always there to save the day. Therefore, many people would not normally default to using the Completing the Square method unless expressly called for in a test/assignment. I agree with you that -b/2a for calculating the x coordinate of the vertex, and doing y = f(-b/2a) is also more straightforward for many people. Yet, there are some who would even delve into Calculus by getting the first derivative of the quadratic function, and setting the first derivative to zero to get the x coordinate of the turning point, and to do the second derivative just to know whether the graph would be a maximum or minimum, etc. Such people will go into Calculus to look for a solution that could be readily found in Algebra.

You're welcome!

I’ll get to that soon

@@brianmclogan I meant that cant you graph a quadratic by factoring

Factoring also works. You get the two x intercepts, then do a - b/2a to get the x coordinate of the turning point, and f(-b/2a) to get the y coordinate of the vertex.