Question

What are the domain and range of the function f(x) = 3x + 5?
domain: (negative infinity, infinity); range: (0, infinity)
domain: (negative infinity, infinity); range: (5, infinity)
domain:(0, infinity); range: (negative infinity, infinity)
domain: (5, infinity); range: (negative infinity, infinity)

Answer 1

None of the given choices are correct.

For f(x) = 3x + 5:
- Domain = (-∞, ∞) (all real x)
- Range = (-∞, ∞) (for any real y, x = (y − 5)/3 gives f(x) = y)