Engineering Board Exam Reviewer · Derivatives of Algebraic Functions · easy

Find the derivative of y=1/x3.

1. -3/x4
2. 3/x4
3. -1/x4
4. -3/x2

Answer

A. -3/x4

Solution

Write y=x-3. By the power rule: y'=-3x-4=-3/x4.

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