If f(x) = x^3 + x, then f'(x) equals:
A3x^3 + 1
B3x^2 + 1
C3x^2 + 3
Dx^2 + 1
Answer & Solution
Correct answer: B. 3x^2 + 1
1. Differentiate each term on its own.
2. The derivative of x is 1.
3. It is 3x^2 + 1.
_Source: OpenStax Calculus Volume 1, Chapter 3, Derivatives._
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