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How do you apply the power rule to find the derivative of a polynomial function?

To find the derivative of a polynomial function like f(x)=x2f(x) = x^2, identify the exponent n and apply the power rule f'(x) = nx^{n-1}. Bring the exponent down as a coefficient and reduce it by one.

Conditions

  • n is a fixed real exponent.
  • Use x>0x>0 as the common real domain; positive integer powers extend over all real x and negative integer powers exclude x=0x=0.
  • The source presents n≠0n\ne 0; the constant n=0n=0 case is treated separately.

Reasoning, step by step

  1. Identify the function f(x)=x2f(x) = x^2.
  2. Apply the power rule with n=2n=2 to get f'(x) = 2x2−12x^{2-1}.
  3. Simplify the exponent to get f'(x) = 2x12x^1.
  4. Write the final simplified form f'(x) = 2x.

Example

The video illustrates the power rule with the example f(x)=x2f(x) = x^2, yielding f'(x) = 2x2−1=2x1=2x2x^{2-1} = 2x^1 = 2x.

Common misconceptions

  • Assuming the power rule is proven in this segment; the source states it is an application lesson with proofs deferred.

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Answers are generated from source material and independently checked. Consult the original video or creator if something is unclear.