Question

what is the range of f(x)= -2x +5 with domain {1,2,3,4}

Answer 1

Evaluate at
f(1) , f(2), f(3), and f(4) to get the corresponding range values.

Answer 2

range is the difference between the solution to the functions of the highest and lowest value of x

Answer 3

The range is the value of y , to find it in this case all you do is evaluate when x = 1, x =2, x= 3, x= 4.
So
when x =1
f(1) = -2(1) +5
= -2 + 5
= 3
so the range is 3 when x = 1, (1,3)