y"-8y'+41y=0 y(0)=0 y'(0)=5 First , using Y for the Laplace transform of y(t), i.e., Y=Lleft{y(t)right} find the equation you get by taking the Laplace transform of the differential equation

necessaryh

necessaryh

Answered question

2021-02-14

y"8y+41y=0
y(0)=0
y(0)=5

Now, using Y for the Laplace transform of y(t), i.e., Y=L{y(t)} find the equation that results from the differential equation's Laplace transformation.

Answer & Explanation

Sadie Eaton

Sadie Eaton

Skilled2021-02-15Added 104 answers

We have:
y"8y+41y=0
y(0)=0
y(0)=5
Solution:
Apply Laplace transform.
L{y"}=s2Y(s)sy(0)y(0)
L{y}=sY(s)y(0)
L{y}=Y(s)
L{c}=cs
L{y"}8L{y}+41L{y}=L{0}
s2Y(s)sy(0)y(0)8[sY(s)y(0)]+41Y(s)=0s
s2Y(s)058[sY(s)0]+41Y(s)=0
Thus, the equation is 
s2Y(s)058[sY(s)0]+41Y(s)=0
Next,
s2Y(s)058[sY(s)0]+41Y(s)=0
Y(s)[s28s+41]=5
Y(s)=5(s28s+41)
Therefore, the value of Y(s)=5(s28s+41)
Apply inverse Laplace transform
Y(s)=5(s28s+41)
=5(s28s+16+25)
=5(s4)2+52
y(t)=L1(5(s4)2+52)
y(t)=e4tsin(5t)
Therefore, the value of y(t)=e4tsin(5t)

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