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If f(x) = 2x + 3, what is f(5)?

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Question: If f(x) = 2x + 3, what is f(5)?

Options:

  1. 10
  2. 13
  3. 15
  4. 8

Correct Answer: 13

Solution: 

f(5) = 2(5) + 3 = 10 + 3 = 13.

If f(x) = 2x + 3, what is f(5)?

Practice Questions

Q1
If f(x) = 2x + 3, what is f(5)?
  1. 10
  2. 13
  3. 15
  4. 8

Questions & Step-by-Step Solutions

If f(x) = 2x + 3, what is f(5)?
  • Step 1: Identify the function f(x) which is given as f(x) = 2x + 3.
  • Step 2: Substitute the value of x with 5 in the function. This means we replace x with 5 in the equation.
  • Step 3: Calculate 2 times 5. This gives us 2(5) = 10.
  • Step 4: Add 3 to the result from Step 3. So, we calculate 10 + 3.
  • Step 5: The final result is 13, which means f(5) = 13.
  • Function Evaluation – Understanding how to substitute a value into a function and compute the result.
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