Hello Dae-Yun,
Sorry, but t is not cliear to me what help you are looking for here. It may just be me, but please pose your question again. The title didn't translate and that may be part of the problem.
Best,
Bill
Often, the following inquiries are made from customers.

In the case of the above polynomial regression, the estimation equation is given in the form of a red square. In other words,
Y=β0+β1X1+β2(X1-C)^2
I am wondering how you can change these expressions like this, or what options you can change.
Y=β0+β1'X1+β2X1^2+C'
here
β1'=(β1-2Cβ2)X1, C'=β0+β2C^2
Thank you in advance.