I can't transform y = sqrt[3x - x^2] to match this graph.

[ahmedalsai]

Sorry for the large size, but it's number 7, the one marked with blue.
I know I add "-" at the beginning and "- 1 " at the end, but what is the rest and it's explanation?
Thanks in advance.

 

[stapel]

...it's number 7, the one marked with blue.
I know I add "-" at the beginning and "- 1 " at the end...

Why? By what reasoning?

...but what is the rest and it's explanation?

To learn the "explanation" of the topic, please try here. Once you have studied at least three lessons from the list at the link, please attempt the exercise. Then, if you get stuck, you can reply with a clear statement of your thoughts and reasoning, at which point we can provide helps and hints. Thank you!