Modeling the Dynamics of Life: Calculus and Probability for Life Scientists
Modeling the Dynamics of Life: Calculus and Probability for Life Scientists
3rd Edition
ISBN: 9780840064189
Author: Frederick R. Adler
Publisher: Cengage Learning
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Chapter 2.2, Problem 30E
To determine

To find : the average rate of change of the function in terms of Δx and limit as Δx0 .

Expert Solution & Answer
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Answer to Problem 30E

The average rate of change of the function in terms of Δx is 10x+7+5(Δx)

The average rate of change as Δx0 is 10x+7

Explanation of Solution

Given information: f(x)=5x2+7x+3 near x=2 .

Formula used:

Average rate of change = f(x+Δx)f(x)Δx

Calculation:

Finding an expression for f(x+Δx)

  5(x+Δx)2+7(x+Δx)+3=5(x2+2xΔx+(Δx)2)+7(x+Δx)+3=5x2+10xΔx+5(Δx)2+7x+7Δx+3=5x2+7x+3+(10x+7)Δx+5(Δx)2

Substituting the above in formula to find the average rate of change and simplifying further

  (5x2+7x+3+(10x+7)Δx+5(Δx)2)(5x2+7x+3)Δx=(10x+7)Δx+5(Δx)2Δx=10x+7+5(Δx)

Finding the value of the limit by substituting 0 for Δx

  limΔx0f(x+Δx)f(x)Δx=limΔx0(10x+7+5(Δx))=10x+7+5(0)=10x+7

Finding the rate of change when x=2

  10(2)+7=20+7=27

Finding f(2) by substituting 2 for x in the function f(x)=5x2+7x+3

  f(2)=5(2)2+7(2)+3=20+14+3=37

Equation of tangent line at x=2 found by substituting the point (2,37) and slope m=27 in the point slope form yy1=m(xx1) , then

  • Distributing 27 in right side of equation
  • Adding 37 on both sides

y37=27(x2)y37=27x54y37+37=27x54+37y=27x17

Graph:

  Modeling the Dynamics of Life: Calculus and Probability for Life Scientists, Chapter 2.2, Problem 30E

Interpretation:

The rate of change of the function f(x)=5x2+7x+3 near x=2 is 27

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Chapter 2 Solutions

Modeling the Dynamics of Life: Calculus and Probability for Life Scientists

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Prob. 24ECh. 2.9 - Prob. 25ECh. 2.9 - Prob. 26ECh. 2.9 - Prob. 27ECh. 2.9 - Prob. 28ECh. 2.9 - Prob. 29ECh. 2.9 - Prob. 30ECh. 2.9 - Prob. 31ECh. 2.9 - Prob. 32ECh. 2.9 - Prob. 33ECh. 2.9 - Prob. 34ECh. 2.9 - Prob. 35ECh. 2.9 - Prob. 36ECh. 2.9 - Prob. 38ECh. 2.9 - Prob. 39ECh. 2.9 - Prob. 40ECh. 2.9 - Prob. 41ECh. 2.9 - Prob. 42ECh. 2.9 - Prob. 43ECh. 2.9 - Prob. 44ECh. 2.9 - The method of implicit differentiation is often...Ch. 2.9 - Prob. 46ECh. 2.9 - Prob. 47ECh. 2.9 - Prob. 48ECh. 2.9 - Prob. 49ECh. 2.9 - Prob. 50ECh. 2.9 - Prob. 51ECh. 2.9 - Prob. 52ECh. 2.9 - Prob. 53ECh. 2.10 - Prob. 1ECh. 2.10 - Prob. 2ECh. 2.10 - Prob. 3ECh. 2.10 - Prob. 4ECh. 2.10 - Prob. 5ECh. 2.10 - Prob. 6ECh. 2.10 - Prob. 7ECh. 2.10 - Prob. 8ECh. 2.10 - Prob. 9ECh. 2.10 - Prob. 10ECh. 2.10 - Prob. 11ECh. 2.10 - Prob. 12ECh. 2.10 - Prob. 13ECh. 2.10 - Prob. 14ECh. 2.10 - Prob. 15ECh. 2.10 - Prob. 16ECh. 2.10 - Prob. 17ECh. 2.10 - Prob. 18ECh. 2.10 - Prob. 19ECh. 2.10 - Prob. 20ECh. 2.10 - Prob. 21ECh. 2.10 - 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