What is the vertex of the function?

f(x)=x2−4x−7

(-2, 11)

(2, 0)

(0, -7)

(2, -11)

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.