In any parabola, the vertex is the turning point. And the x-coordinate of the vertex can be found using

So, in your case, you have

So, your equation actually looks like

Now impose the passing through (2,1), i.e. substitute x=2, y=1 and solve for b:

Answer:
6
Step-by-step explanation:
subtract 40 from both sides
divide both sides by 4.5
you're left with v equals 6
Answer:
y= -(x+5)^2+4
Step-by-step explanation:
Use transformations
What do you mean? i don’t quite get this question
Answer:
wasting your points but hey these are the answers
Step-by-step explanation:
1) 72
2) 2
3) 30
4) 2