Engineering Board Exam Reviewer · Differentials and Linear Approximation · easy

If y=x3, find dy when x=2 and dx=0.1.

  1. 12
  2. 1.26
  3. 0.8
  4. 1.2

Answer

D. 1.2

Solution

dy=3x2,dx=3(4)(0.1)=1.2. (The actual change y=2.13-8=1.261.)

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