Explanation Given: The differential equation is y ″ ( t ) − 4 2 y ′ + 8 y = 0 at the initial value y ( 0 ) = 1 and y ′ ( 0 ) = 0 . Result used: The general solution of y ″ ( t ) + p y ′ ( t ) + q y ( t ) = 0 is y = c 1 e r t + c 2 t e r t (1) if the repeated roots. Calculation: Let the constant-coefficient homogeneous equation of the general form is y ″ ( t ) + p y ′ ( t ) + q y ( t ) = 0 where p and q are constants and the characteristic equation is of the form r 2 + p r + q = 0 (2) The equation is y ″ ( t ) − 4 2 y ′ + 8 y = 0 where p = − 4 2 and q = 8 . Substitute − 1 for p and 1 4 for q in equation (2), r 2 + ( − 1 ) r + 1 4 = 0 . That is, r 2 − 4 2 r + 8 = 0 r 2 − 4 2 r + 2 ⋅ 4 = 0 ( r − 2 2 ) 2 = 0 That is, the characteristic equation has repeated roots. Substitute 1 for r in equation (1), y ( t ) = c 1 e 2 t 2 + c 2 t e 2 t 2 . Hence, the general solution is y ( t ) = c 1 e 2 t 2 + c 2 t e 2 t 2 (3) Differentiate y ( t ) with respect to t , y ′ ( t ) = d d t ( c 1 e 2 t 2 + c 2 t e 2 t 2 )

Calculus: Early Transcendentals, 2nd Edition

2nd Edition

ISBN: 9780321965165

Author: William L. Briggs, Lyle Cochran, Bernard Gillett

Publisher: PEARSON

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Chapter D2.2, Problem 24E

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To find: The general solution of the differential equation y″(t)−42y′+8y=0 with the initial conditions y(0)=1 and y′(0)=0 .

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Chapter D2.2, Problem 23E

Chapter D2.2, Problem 25E

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Chapter D2 Solutions

Calculus: Early Transcendentals, 2nd Edition

Ch. D2.1 - Describe how to find the order of a differential...Ch. D2.1 - Prob. 2E Ch. D2.1 - Prob. 3E Ch. D2.1 - Give a general form of a second-order linear...Ch. D2.1 - Prob. 5E Ch. D2.1 - Prob. 6E Ch. D2.1 - Prob. 7E Ch. D2.1 - Prob. 8E Ch. D2.1 - Prob. 9E Ch. D2.1 - Prob. 10E

Ch. D2.1 - Prob. 11E Ch. D2.1 - Prob. 12E Ch. D2.1 - Prob. 13E Ch. D2.1 - Verifying solutions Verify by substitution that...Ch. D2.1 - Prob. 15E Ch. D2.1 - Prob. 16E Ch. D2.1 - Prob. 17E Ch. D2.1 - Prob. 18E Ch. D2.1 - Prob. 19E Ch. D2.1 - Prob. 20E Ch. D2.1 - Prob. 21E Ch. D2.1 - Prob. 22E Ch. D2.1 - Prob. 23E Ch. D2.1 - Prob. 24E Ch. D2.1 - Prob. 25E Ch. D2.1 - Prob. 26E Ch. D2.1 - Prob. 27E Ch. D2.1 - Prob. 28E Ch. D2.1 - Prob. 29E Ch. D2.1 - Prob. 30E Ch. D2.1 - Prob. 31E Ch. D2.1 - Prob. 32E Ch. D2.1 - Prob. 33E Ch. D2.1 - Prob. 34E Ch. D2.1 - Prob. 35E Ch. D2.1 - Prob. 36E Ch. D2.1 - Prob. 37E Ch. D2.1 - Prob. 38E Ch. D2.1 - Prob. 39E Ch. D2.1 - Prob. 40E Ch. D2.1 - Prob. 41E Ch. D2.1 - Prob. 42E Ch. D2.1 - Prob. 43E Ch. D2.1 - Initial value problems Solve the following initial...Ch. D2.1 - Prob. 45E Ch. D2.1 - Prob. 46E Ch. D2.1 - Explain why or why not Determine whether the...Ch. D2.1 - Prob. 48E Ch. D2.1 - Solution verification Verify by substitution that...Ch. D2.1 - Prob. 50E Ch. D2.1 - Prob. 51E Ch. D2.1 - Prob. 52E Ch. D2.1 - Prob. 53E Ch. D2.1 - Prob. 54E Ch. D2.1 - Prob. 55E Ch. D2.1 - Prob. 56E Ch. D2.1 - Prob. 57E Ch. D2.1 - Prob. 58E Ch. D2.1 - Prob. 59E Ch. D2.1 - Prob. 60E Ch. D2.1 - Prob. 61E Ch. D2.1 - Prob. 62E Ch. D2.1 - Prob. 63E Ch. D2.1 - Prob. 64E Ch. D2.1 - Prob. 65E Ch. D2.1 - Prob. 66E Ch. D2.1 - Prob. 67E Ch. D2.1 - Prob. 68E Ch. D2.1 - Prob. 69E Ch. D2.1 - Reduction of order Suppose you are solving a...Ch. D2.2 - Prob. 1E Ch. D2.2 - Prob. 2E Ch. D2.2 - Prob. 3E Ch. D2.2 - Prob. 4E Ch. D2.2 - Prob. 5E Ch. D2.2 - Prob. 6E Ch. D2.2 - Prob. 7E Ch. D2.2 - Give the trial solution used to solve a...Ch. D2.2 - Prob. 9E Ch. D2.2 - Prob. 10E Ch. D2.2 - General solutions with distinct real roots Find...Ch. D2.2 - Prob. 12E Ch. D2.2 - Prob. 13E Ch. D2.2 - Prob. 14E Ch. D2.2 - Initial value problems with distinct real roots...Ch. D2.2 - Prob. 16E Ch. D2.2 - Prob. 17E Ch. D2.2 - Prob. 18E Ch. D2.2 - Prob. 19E Ch. D2.2 - Prob. 20E Ch. D2.2 - Prob. 21E Ch. D2.2 - Prob. 22E Ch. D2.2 - Prob. 23E Ch. D2.2 - Prob. 24E Ch. D2.2 - Prob. 25E Ch. D2.2 - Prob. 26E Ch. D2.2 - Prob. 27E Ch. D2.2 - Prob. 28E Ch. D2.2 - Prob. 29E Ch. D2.2 - Prob. 30E Ch. D2.2 - Prob. 31E Ch. D2.2 - Prob. 32E Ch. D2.2 - Prob. 33E Ch. D2.2 - Prob. 34E Ch. D2.2 - Initial value problems with Cauchy-Euler equations...Ch. D2.2 - Prob. 36E Ch. D2.2 - Prob. 37E Ch. D2.2 - Initial value problems with Cauchy-Euler equations...Ch. D2.2 - Prob. 39E Ch. D2.2 - Prob. 42E Ch. D2.2 - Prob. 43E Ch. D2.2 - Prob. 44E Ch. D2.2 - Prob. 45E Ch. D2.2 - Prob. 46E Ch. D2.2 - Prob. 47E Ch. D2.2 - Prob. 48E Ch. D2.2 - Prob. 49E Ch. D2.2 - Prob. 50E Ch. D2.2 - Prob. 51E Ch. D2.2 - Cauchy-Euler equation with repeated roots It can...Ch. D2.2 - Prob. 53E Ch. D2.2 - Prob. 54E Ch. D2.2 - Prob. 55E Ch. D2.2 - Prob. 56E Ch. D2.2 - Prob. 57E Ch. D2.2 - Prob. 58E Ch. D2.2 - Prob. 59E Ch. D2.2 - Prob. 60E Ch. D2.2 - Prob. 61E Ch. D2.2 - Cauchy-Euler equation with repeated roots One of...Ch. D2.2 - Prob. 63E Ch. D2.2 - Prob. 64E Ch. D2.2 - Prob. 65E Ch. D2.2 - Prob. 66E Ch. D2.3 - Explain how to find the general solution of the...Ch. D2.3 - Prob. 2E Ch. D2.3 - Prob. 3E Ch. D2.3 - Prob. 4E Ch. D2.3 - Prob. 5E Ch. D2.3 - Prob. 6E Ch. D2.3 - Prob. 7E Ch. D2.3 - Prob. 8E Ch. D2.3 - Prob. 9E Ch. D2.3 - Prob. 10E Ch. D2.3 - Prob. 11E Ch. D2.3 - Prob. 12E Ch. D2.3 - Prob. 13E Ch. D2.3 - Undetermined coefficients with exponentials Find a...Ch. D2.3 - Prob. 15E Ch. D2.3 - Prob. 16E Ch. D2.3 - Prob. 17E Ch. D2.3 - Prob. 18E Ch. D2.3 - Prob. 19E Ch. D2.3 - Prob. 20E Ch. D2.3 - Prob. 21E Ch. D2.3 - Prob. 22E Ch. D2.3 - Prob. 23E Ch. D2.3 - Prob. 24E Ch. D2.3 - Prob. 25E Ch. D2.3 - Prob. 26E Ch. D2.3 - Prob. 27E Ch. D2.3 - Prob. 28E Ch. D2.3 - Prob. 29E Ch. D2.3 - Prob. 30E Ch. D2.3 - Prob. 31E Ch. D2.3 - Prob. 32E Ch. D2.3 - Prob. 33E Ch. D2.3 - Prob. 34E Ch. D2.3 - Prob. 35E Ch. D2.3 - Prob. 36E Ch. D2.3 - Prob. 37E Ch. D2.3 - Initial value problems Find the general solution...Ch. D2.3 - Prob. 39E Ch. D2.3 - Prob. 40E Ch. D2.3 - Prob. 41E Ch. D2.3 - Prob. 42E Ch. D2.3 - Prob. 43E Ch. D2.3 - Prob. 44E Ch. D2.3 - Prob. 45E Ch. D2.3 - Prob. 46E Ch. D2.3 - Prob. 47E Ch. D2.3 - Prob. 48E Ch. D2.3 - Prob. 49E Ch. D2.3 - Prob. 50E Ch. D2.3 - Prob. 51E Ch. D2.3 - Variation of parameters Finding a particular...Ch. D2.4 - Explain the meaning of the words damped, undamped,...Ch. D2.4 - In the models discussed in this section, under...Ch. D2.4 - Prob. 3E Ch. D2.4 - Prob. 4E Ch. D2.4 - Prob. 5E Ch. D2.4 - Prob. 6E Ch. D2.4 - Prob. 7E Ch. D2.4 - Prob. 8E Ch. D2.4 - Prob. 9E Ch. D2.4 - Free undamped oscillations Solve the initial value...Ch. D2.4 - Prob. 11E Ch. D2.4 - Prob. 12E Ch. D2.4 - Prob. 13E Ch. D2.4 - Prob. 14E Ch. D2.4 - Prob. 15E Ch. D2.4 - Prob. 16E Ch. D2.4 - Free damped oscillations Solve the initial value...Ch. D2.4 - Free damped oscillations Solve the initial value...Ch. D2.4 - Designing a shock absorber A shock absorber must...Ch. D2.4 - Designing a suspension system A spring in a...Ch. D2.4 - Forced damped oscillations 21.A 1-kg block hangs...Ch. D2.4 - Forced damped oscillations 22.A 20-kg block hangs...Ch. D2.4 - Prob. 23E Ch. D2.4 - Prob. 24E Ch. D2.4 - Prob. 25E Ch. D2.4 - Prob. 26E Ch. D2.4 - Prob. 27E Ch. D2.4 - LCR circuits 28.The circuit in Exercise 27 (10-ohm...Ch. D2.4 - Prob. 29E Ch. D2.4 - Prob. 30E Ch. D2.4 - Prob. 31E Ch. D2.4 - LCR circuits 32.Find the charge on the capacitor...Ch. D2.4 - Explain why or why not Determine whether the...Ch. D2.4 - Prob. 34E Ch. D2.4 - Prob. 35E Ch. D2.4 - Prob. 36E Ch. D2.4 - Prob. 37E Ch. D2.4 - Prob. 38E Ch. D2.4 - Prob. 39E Ch. D2.4 - Prob. 41E Ch. D2.4 - Prob. 42E Ch. D2.4 - Prob. 43E Ch. D2.4 - Prob. 44E Ch. D2.4 - Applications 4346.Horizontal oscillators The...Ch. D2.4 - Prob. 46E Ch. D2.4 - Prob. 47E Ch. D2.4 - Prob. 48E Ch. D2.4 - Prob. 49E Ch. D2.4 - Prob. 51E Ch. D2.4 - Prob. 52E Ch. D2.5 - Prob. 1E Ch. D2.5 - Prob. 2E Ch. D2.5 - Prob. 3E Ch. D2.5 - Prob. 4E Ch. D2.5 - Prob. 5E Ch. D2.5 - Prob. 6E Ch. D2.5 - Prob. 7E Ch. D2.5 - Prob. 8E Ch. D2.5 - Gain and phase lag functions Consider the...Ch. D2.5 - Prob. 10E Ch. D2.5 - Prob. 11E Ch. D2.5 - Solutions to oscillator equations Consider the...Ch. D2.5 - Prob. 13E Ch. D2.5 - Solutions to oscillator equations Consider the...Ch. D2.5 - Prob. 15E Ch. D2.5 - Prob. 16E Ch. D2.5 - Prob. 17E Ch. D2.5 - Prob. 18E Ch. D2.5 - Analyzing circuit equations Consider the circuit...Ch. D2.5 - Prob. 20E Ch. D2.5 - Prob. 21E Ch. D2.5 - Prob. 22E Ch. D2.5 - Prob. 23E Ch. D2.5 - A high-pass filter Consider the LCR circuit shown...Ch. D2.5 - High-pass filters Consider the high-pass filter...Ch. D2.5 - Prob. 26E Ch. D2.5 - High-pass filters Consider the high-pass filter...Ch. D2.5 - Prob. 28E Ch. D2 - Prob. 1RE Ch. D2 - Prob. 2RE Ch. D2 - Prob. 3RE Ch. D2 - Prob. 4RE Ch. D2 - Solving homogeneous equations Find the general...Ch. D2 - Prob. 6RE Ch. D2 - Prob. 7RE Ch. D2 - Prob. 8RE Ch. D2 - Prob. 9RE Ch. D2 - Prob. 10RE Ch. D2 - Prob. 11RE Ch. D2 - Prob. 12RE Ch. D2 - Prob. 13RE Ch. D2 - Prob. 14RE Ch. D2 - Prob. 15RE Ch. D2 - Prob. 16RE Ch. D2 - Prob. 17RE Ch. D2 - Prob. 18RE Ch. D2 - Prob. 19RE Ch. D2 - Prob. 20RE Ch. D2 - Prob. 21RE Ch. D2 - Forced undamped oscillations A 4-kg block hangs on...Ch. D2 - Free damped oscillations A 0.2-kg block hangs on a...

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The general solution of the differential equation y ″ ( t ) − 4 2 y ′ + 8 y = 0 with the initial conditions y ( 0 ) = 1 and y ′ ( 0 ) = 0 .

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To find: The general solution of the differential equation y″(t)−42y′+8y=0 with the initial conditions y(0)=1 and y′(0)=0 .

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Chapter D2 Solutions