Question

What is the range of the function f(x) = 4x + 9, given the domain D = {-4, -2, 0, 2}?


R = {-7, -1, 9, 17}

R = {1, 7, 9, 17}

R = {-17, -9, -1, 17}

R = {-7, 1, 9, 17}

Answer 1

Evaluate f(x) = 4x + 9 for each of the input values in D = {-4, -2, 0, 2}:

f(-4) = 4(-4) + 9 = -7 (and so on)
f(-2) = 1
f(0) = 9
f(2) = 17

The range is R:  {-7, 1, 9, 17}