Decide whether 3f”(x)+20f’(x)-7f(x)=0 for f(x)=ae^r 1^x + be^r 2^x. Substitute your values for r1 and r2 into f(x), then find f’(x) and f”(x).

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Decide whether 3f”(x)+20f’(x)-7f(x)=0 for f(x)=ae^r 1^x + be^r 2^x. Substitute your values for r1 and r2 into f(x), then find f’(x) and f”(x).
(b) If r, and r, are the values of r that you found in part (a), show that every member of the family of functions y = ae'1 + be'2* is also a solution.
Let r, be the larger value and r, be the smaller value. We need to show that every member of the family of functions y = ae'1* + be 2* is a solution of the differential equation
3y" + 20y' – 7y = 0.
We must decide whether 3f"(x) + 20f'(x) – 7f(x) = 0 for f(x) = ae'1* + be 2*.
Substitute your values for r, and r, into f(x), then find f'(x) and f"(x).
We have f'(x) =
1
499e
3 de
7be ix
and f"(x) =
-7x
+ 16be
Transcribed Image Text:(b) If r, and r, are the values of r that you found in part (a), show that every member of the family of functions y = ae'1 + be'2* is also a solution. Let r, be the larger value and r, be the smaller value. We need to show that every member of the family of functions y = ae'1* + be 2* is a solution of the differential equation 3y" + 20y' – 7y = 0. We must decide whether 3f"(x) + 20f'(x) – 7f(x) = 0 for f(x) = ae'1* + be 2*. Substitute your values for r, and r, into f(x), then find f'(x) and f"(x). We have f'(x) = 1 499e 3 de 7be ix and f"(x) = -7x + 16be
We have f'(x) =
-7be 7r
and f"(x) =
49de
-7x
+ 16be
1//3
Transcribed Image Text:We have f'(x) = -7be 7r and f"(x) = 49de -7x + 16be 1//3
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