Let f(x) = x² - 4x + 3. Which of the following statements about the derivative f'(x) is true?

Core Concept

Using the power rule for differentiation, the derivative of x² is 2x, the derivative of -4x is -4, and the derivative of 3 is 0. Therefore, f'(x) = 2x - 4. Option B is incorrect because the derivative of -4x is -4, not +4. Option C is incorrect because it doesn't properly apply the power rule to each term. Option D is incorrect because it incorrectly applies the power rule to the constant term.