Question

find the domain and range of the real function f defined by $f\left(x\right)=\sqrt{x-1}$

Or

Let f= {(1,1), (2,3),(0,-1),(-1,-3)} be a function from Z to Z defined by f(x) = ax+b from some integers a and b. Determine a and b.

Answer 1

Domain $\left(f\right)=[1,\infty )andRange=[,\infty )$

Or

a = 2 and b = -1