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If the function f(x) is defined as f(x) = 2x + 1, what is the value of f(3)?

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Question: If the function f(x) is defined as f(x) = 2x + 1, what is the value of f(3)?

Options:

  1. 5
  2. 6
  3. 7
  4. 8

Correct Answer: 7

Solution: 

Substituting x = 3 into the function gives f(3) = 2(3) + 1 = 6 + 1 = 7.

If the function f(x) is defined as f(x) = 2x + 1, what is the value of f(3)?

Practice Questions

Q1
If the function f(x) is defined as f(x) = 2x + 1, what is the value of f(3)?
  1. 5
  2. 6
  3. 7
  4. 8

Questions & Step-by-Step Solutions

If the function f(x) is defined as f(x) = 2x + 1, what is the value of f(3)?
  • Step 1: Identify the function f(x) which is given as f(x) = 2x + 1.
  • Step 2: We need to find the value of f(3). This means we will substitute x with 3 in the function.
  • Step 3: Substitute 3 into the function: f(3) = 2(3) + 1.
  • Step 4: Calculate 2(3), which equals 6.
  • Step 5: Now add 1 to the result from Step 4: 6 + 1 equals 7.
  • Step 6: Therefore, the value of f(3) is 7.
  • Function Evaluation – Understanding how to substitute a value into a function to find its output.
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