I will give brainlisted for whoever gets it right! NEED HELP ASAP DUE TODAY!!!

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]

Can someone me and do the problem plz so i can understand it more better

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?