<item ident="D4-5523" title="D4 | Using Laplace transforms to solve IVPs | ver. 5523">
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<p>
<strong>D4.</strong>
</p>
<p> Explain how to solve the following IVP. </p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1" alt="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1" title="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1" data-latex="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1"/>
</p>
<p>Hint: <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}" alt="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}" title="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}" data-latex="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}"/>.</p>
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<mattext texttype="text/html"><div class="exercise-statement">
<p>
<strong>D4.</strong>
</p>
<p> Explain how to solve the following IVP. </p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?-8%20%5C,%20%5Cdelta%5Cleft(t%20-%203%5Cright)%20=%20-2%20%5C,%20%7By''%7D%20-%2024%20%5C,%20%7By%7D%20+%2014%20%5C,%20%7By'%7D%20%5Chspace%7B2em%7D%20y(0)=%200%20,%20y'(0)=%201" alt="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1" title="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1" data-latex="-8 \, \delta\left(t - 3\right) = -2 \, {y''} - 24 \, {y} + 14 \, {y'} \hspace{2em} y(0)= 0 , y'(0)= 1">
</p>
<p>Hint: <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cfrac%7B1%7D%7Bs%5E%7B2%7D%20-%207%20%5C,%20s%20+%2012%7D%20=%20-%5Cfrac%7B1%7D%7Bs%20-%203%7D%20+%20%5Cfrac%7B1%7D%7Bs%20-%204%7D" alt="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}" title="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}" data-latex="\frac{1}{s^{2} - 7 \, s + 12} = -\frac{1}{s - 3} + \frac{1}{s - 4}">.</p>
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<div class="exercise-answer">
<h4>Partial Answer:</h4>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}" alt="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}" title="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}" data-latex="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}"/>
</p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}" alt="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}" title="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}" data-latex="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}"/>
</p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}" alt="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}" title="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}" data-latex="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}"/>
</p>
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<mattext texttype="text/html"><div class="exercise-answer">
<h4>Partial Answer:</h4>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cmathcal%7BL%7D%5C%7By%5C%7D=%20%5Cfrac%7B4%20%5C,%20e%5E%7B%5Cleft(-3%20%5C,%20s%5Cright)%7D%7D%7Bs%5E%7B2%7D%20-%207%20%5C,%20s%20+%2012%7D%20+%20%5Cfrac%7B1%7D%7Bs%5E%7B2%7D%20-%207%20%5C,%20s%20+%2012%7D" alt="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}" title="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}" data-latex="\mathcal{L}\{y\}= \frac{4 \, e^{\left(-3 \, s\right)}}{s^{2} - 7 \, s + 12} + \frac{1}{s^{2} - 7 \, s + 12}">
</p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cmathcal%7BL%7D%5C%7By%5C%7D=%20-%5Cfrac%7B4%20%5C,%20e%5E%7B%5Cleft(-3%20%5C,%20s%5Cright)%7D%7D%7Bs%20-%203%7D%20+%20%5Cfrac%7B4%20%5C,%20e%5E%7B%5Cleft(-3%20%5C,%20s%5Cright)%7D%7D%7Bs%20-%204%7D%20-%20%5Cfrac%7B1%7D%7Bs%20-%203%7D%20+%20%5Cfrac%7B1%7D%7Bs%20-%204%7D" alt="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}" title="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}" data-latex="\mathcal{L}\{y\}= -\frac{4 \, e^{\left(-3 \, s\right)}}{s - 3} + \frac{4 \, e^{\left(-3 \, s\right)}}{s - 4} - \frac{1}{s - 3} + \frac{1}{s - 4}">
</p>
<p style="text-align:center;">
<img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%7By%7D%20=%204%20%5C,%20e%5E%7B%5Cleft(4%20%5C,%20t%20-%2012%5Cright)%7D%20%5Cmathrm%7Bu%7D%5Cleft(t%20-%203%5Cright)%20-%204%20%5C,%20e%5E%7B%5Cleft(3%20%5C,%20t%20-%209%5Cright)%7D%20%5Cmathrm%7Bu%7D%5Cleft(t%20-%203%5Cright)%20+%20e%5E%7B%5Cleft(4%20%5C,%20t%5Cright)%7D%20-%20e%5E%7B%5Cleft(3%20%5C,%20t%5Cright)%7D" alt="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}" title="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}" data-latex="{y} = 4 \, e^{\left(4 \, t - 12\right)} \mathrm{u}\left(t - 3\right) - 4 \, e^{\left(3 \, t - 9\right)} \mathrm{u}\left(t - 3\right) + e^{\left(4 \, t\right)} - e^{\left(3 \, t\right)}">
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