Verify the First Mean-Value Theorem for the function g(x) = x + 1 on the interval [1, 2]

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter8: Graphing Quadratic Functions
Section: Chapter Questions
Problem 2CA
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a.
Verify the First Mean-Value Theorem for the function g(x) = x + 1 on the interval
[1, 2]

Expert Solution
Step 1

g(x) = x + 1 is continuous in the interval [1, 2]

It's differentiable in the interval (1, 2)

 

Step 2

g(2) = 2 +1  = 3

g(1) = 1 + 1 = 2

g'(x) = 1

g'(c) = 1 = [g(2) - g(1)] / (2 - 1) = (3 - 2) / 1 = 1

Hence, there exists infinite number of point c in the interval (1, 2) such that g(c) = [g(2) - g(1)] / (2 - 1)

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