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In Problems 13–32 use variation of parameters to solve the given nonhomogeneous system.
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Chapter 8 Solutions
A First Course in Differential Equations with Modeling Applications (MindTap Course List)
- II. Solve the following Bernoulli's equations. 1. y'(t) = 3y – y. Answer. y =esy and y = 0. 1+ce- 2. y' -ty = y, y(2) = -2. Answer. y =x 2-x2 3. xy' + y + xy = 0, y(1) = 2. Answer. y = x(1+2 In x) 4. y' +y = xy', y(0) = -1. Answer. y = - 5. 2 = dy +2x dx Answer. y = +V-1 – 2x + ce2x, 6. y' + xV = 3y. Answer, y = 2 (; + + c*}, and y = 0. Hint. When dividing the equation by Vy. one needs to check if y = 0 is a solution, and indeed it is. 7. y' + y = -xy². Answer. y = " and y = 0. ce-x-1 8. y' + xy = y", y(1) = -! Answer. y = - 1.7. Numerical Solution by Euler's Method 35 9. The equation dy y? + 2x xp y could not be solved in the preceding problem set because it is not homoge- neous. Can you solve it now? Answer. y =tVcezx – 2x – 1. 10. y' = ex +y. Answer. y = te/x² + c. . 11. Solve the Gompertz population model (a and b are positive constants) dx dt = x (a – b ln x), x> 1. Hint. Setting y = In x, obtain y = a – by. Answer. x(t) = q@/bce-br 12. Solve x(y - e) + 2 = 0. Hint. Divide the…arrow_forward3. Suppose ay" + by' + cy = 0 with y(0) = d and y'(0) = k has a general solution y 4e2 - What are the constants a, b, c, d, and k ?arrow_forwardSolve the given differential equationsarrow_forward
- Example: Discuss the existence and unique solution for the IVP y'= 3y 3, y (0) =0arrow_forward12. [Kaplan & Glass(1995)] Limpets and seaweed live in a tide pool. The dynamics of this system are given by the differential equations ds s² – sl, = S dt dl sl --2, 1>0,s > 0, dt 2 where the densities of seaweed and limpets are given by s and l, respectively. (i) Determine all equilibria of this system. (ii) For each nonzero equilibrium determined in part (a), evaluate the stability and classify it as a node, focus, or saddle point. (iii) Sketch the flows in the phase plane. (iv) What will the dynamics be in the limit as t → o for initial conditions (i) s(0) = 0, 1(0) = 0? (iї) s(0) — 0, 1(0) — 15? (iii) s(0) = 2, 1(0) = 0? (iv) s(0) = 2, 1(0) = 15?arrow_forwardpart 3 4 5arrow_forward
- Q.1 Solve the following B.V.P. y" – y = 2e*, y(0) – 2y'(0) =-1, 3y(1)– y'(1) = e .arrow_forward2) Solve the given initial problem. a) 9y"-12y'+4y = 0 ; y(0) = 2, y'(0) = -1 ; y(0) = 0, y'(0)=2 ; y(-1) = 2, y'(-1) = 1 ; y(0) = 2, y'(0) = 1 ; z(0) = 0, z'(0) = 3 b) y"-6y'+9y = 0 c) y"+4y'+4y = 0 d) y"+y' = 0 %3D e) z"-2z'-2z = 0 %3Darrow_forwardSuppose we are given y1(x) and y2(x) (with y1 # y2), which are two different solutions of a nonhomogeneous equation y" + p(x)y + q(x)y = g(x) In three steps, describe how to write down the general solution of (1): (1) Step 1: Step 2: Step 3:arrow_forward
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