What is the domain of the function f(x) = 3x?

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NDA (Held On: 18 Apr 2021) Maths Previous Year paper
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  1. (-∞, ∞)
  2. (0, ∞)
  3. [0, ∞)
  4. (-∞, ∞) - {0}

Answer (Detailed Solution Below)

Option 1 : (-∞, ∞)
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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Concept:

The domain is the set of all possible value of x which have a finite value of f(x).

Calculation:

Given function f(x) = 3x

The function will have a finite value for all x ∈ (-∞, ∞)

Mistake PointsThe range of the given function will be from (0,∞). 0, when x = -∞, and ∞ when x = ∞. 

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