Express x^2 -8x+5 in the form (x-a)^2 -b where a and b are integers

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

Which function has the domain x> -11