Question

Given the function f(x) = - 4x + 2. Find the range using the domain.

D:{-1, 2}
R: { }

Answer 1

D = {-6,6}

Explanation:

The range are the images of the domain elements.

The image of -1 is f(-1)

f(-1) = -4(-1) +2 = 4 + 2 = 6

The image of 2 is f(2)

f(2) = -4(2) +2 = -8 + 2 = -6

So the domain is

D = {-6, 6}