Question #284192

IV. Find the general solution of the given differential equation.

11/234) y‴ − y″ − y′ + y = 0

14/234) y^(4) − 4y‴ + 4y″ = 0




1
Expert's answer
2022-01-04T11:27:43-0500

11/234)yyy+y=0λ3λ2λ+1=0λ2(λ1)(λ1)=0(λ1)(λ21)=0(λ1)2(λ+1)=0λ1=λ2=1,λ3=1y=c1ex+c2xex+c3ex.14/234)y(4)4y+4y=0λ44λ3+4λ2=0λ2(λ24λ+4)=0λ2(λ2)2=0λ1=λ2=0,λ3=λ4=2y=c1+c2x+c3e2x+c4xe2x11/234) y'''-y''-y'+y=0\\ \lambda^3-\lambda^2-\lambda+1=0\\ \lambda^2(\lambda-1)-(\lambda-1)=0\\ (\lambda-1)(\lambda^2-1)=0\\ (\lambda-1)^2(\lambda+1)=0\\ \lambda_1=\lambda_2=1, \lambda_3=-1\\ y=c_1e^x+c_2xe^x+c_3e^{-x}.\\ \\ 14/234) y^{(4)}-4y'''+4y''=0\\ \lambda^4-4\lambda^3+4\lambda^2=0\\ \lambda^2(\lambda^2-4\lambda+4)=0\\ \lambda^2(\lambda-2)^2=0\\ \lambda_1=\lambda_2=0, \lambda_3=\lambda_4=2\\ y=c_1+c_2x+c_3e^{2x}+c_4xe^{2x}


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