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If f(x) = 3x - 4, what is f(-2)?

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Question: If f(x) = 3x - 4, what is f(-2)?

Options:

  1. -10
  2. -8
  3. -6
  4. -4

Correct Answer: -10

Solution: 

f(-2) = 3(-2) - 4 = -6 - 4 = -10.

If f(x) = 3x - 4, what is f(-2)?

Practice Questions

Q1
If f(x) = 3x - 4, what is f(-2)?
  1. -10
  2. -8
  3. -6
  4. -4

Questions & Step-by-Step Solutions

If f(x) = 3x - 4, what is f(-2)?
  • Step 1: Identify the function f(x) = 3x - 4.
  • Step 2: Substitute -2 for x in the function. This means we replace x with -2.
  • Step 3: Write the equation with the substitution: f(-2) = 3(-2) - 4.
  • Step 4: Calculate 3 times -2. This gives us -6.
  • Step 5: Now, subtract 4 from -6. So, -6 - 4 equals -10.
  • Step 6: Therefore, f(-2) = -10.
  • Function Evaluation – Understanding how to substitute a value into a function to find the output.
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