Engineering Board Exam Reviewer · Derivatives of Algebraic Functions · easy

Find y' if y=7x3-5x+ 2x.

1. 7 x2 - 5 - 2x2
2. 21 x2 - 5 - 2x2
3. 21 x2 - 5 - 2/x
4. 21 x2 + 5 - 2x2

Answer

B. 21 x2 - 5 - 2x2

Solution

Rewrite 2x=2x-1. Then y'=21x2-5-2x-2=21x2-5-2/x2.

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