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If f(x) = x^2 + 2x + 3, find f'(1).

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Question: If f(x) = x^2 + 2x + 3, find f\'(1).

Options:

  1. 2
  2. 3
  3. 4
  4. 5

Correct Answer: 4

Solution:

f\'(x) = 2x + 2. Therefore, f\'(1) = 2(1) + 2 = 4.

If f(x) = x^2 + 2x + 3, find f'(1).

Practice Questions

Q1
If f(x) = x^2 + 2x + 3, find f'(1).
  1. 2
  2. 3
  3. 4
  4. 5

Questions & Step-by-Step Solutions

If f(x) = x^2 + 2x + 3, find f'(1).
  • Step 1: Identify the function f(x) = x^2 + 2x + 3.
  • Step 2: Find the derivative of the function f(x). The derivative f'(x) tells us the rate of change of f(x).
  • Step 3: Use the power rule to differentiate each term: The derivative of x^2 is 2x, the derivative of 2x is 2, and the derivative of a constant (3) is 0.
  • Step 4: Combine the derivatives to get f'(x) = 2x + 2.
  • Step 5: Now, we need to find f'(1). This means we will substitute x = 1 into the derivative f'(x).
  • Step 6: Substitute x = 1 into f'(x): f'(1) = 2(1) + 2.
  • Step 7: Calculate the result: f'(1) = 2 + 2 = 4.
  • Differentiation – Understanding how to find the derivative of a polynomial function.
  • Function Evaluation – Evaluating the derivative at a specific point.
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