<item ident="D3-8007" title="D3 | Inverse Laplace transforms | ver. 8007"> <itemmetadata> <qtimetadata> <qtimetadatafield> <fieldlabel>question_type</fieldlabel> <fieldentry>essay_question</fieldentry> </qtimetadatafield> </qtimetadata> </itemmetadata> <presentation> <material> <mattextxml> <div class="exercise-statement"> <p> <strong>D3.</strong> </p> <p> Explain how to use convolution along with the formula <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\mathcal{L}\{e^{at})=\frac{1}{s-a}" alt="\mathcal{L}\{e^{at})=\frac{1}{s-a}" title="\mathcal{L}\{e^{at})=\frac{1}{s-a}" data-latex="\mathcal{L}\{e^{at})=\frac{1}{s-a}"/>to find the following inverse Laplace transform: </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}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}" alt="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}" title="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}" data-latex="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}"/> </p> </div> </mattextxml> <mattext texttype="text/html"><div class="exercise-statement"> <p> <strong>D3.</strong> </p> <p> Explain how to use convolution along with the formula <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cmathcal%7BL%7D%5C%7Be%5E%7Bat%7D)=%5Cfrac%7B1%7D%7Bs-a%7D" alt="\mathcal{L}\{e^{at})=\frac{1}{s-a}" title="\mathcal{L}\{e^{at})=\frac{1}{s-a}" data-latex="\mathcal{L}\{e^{at})=\frac{1}{s-a}">to find the following inverse Laplace transform: </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%5E%7B-1%7D%5Cleft%5C%7B%20%5Cfrac%7B5%7D%7B7%20%5C,%20%7B%5Cleft(s%20-%201%5Cright)%7D%20%7B%5Cleft(s%20-%207%5Cright)%7D%7D%20%5Cright%5C%7D" alt="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}" title="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}" data-latex="\mathcal{L}^{-1}\left\{ \frac{5}{7 \, {\left(s - 1\right)} {\left(s - 7\right)}} \right\}"> </p> </div> </mattext> </material> <response_str ident="response1" rcardinality="Single"> <render_fib> <response_label ident="answer1" rshuffle="No"/> </render_fib> </response_str> </presentation> <itemfeedback ident="general_fb"> <flow_mat> <material> <mattextxml> <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?\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}" alt="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}" title="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}" data-latex="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}"/> </p> </div> </mattextxml> <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?%5Cfrac%7B5%7D%7B42%7D%20%5C,%20e%5E%7B%5Cleft(7%20%5C,%20t%5Cright)%7D%20-%20%5Cfrac%7B5%7D%7B42%7D%20%5C,%20e%5E%7Bt%7D" alt="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}" title="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}" data-latex="\frac{5}{42} \, e^{\left(7 \, t\right)} - \frac{5}{42} \, e^{t}"> </p> </div> </mattext> </material> </flow_mat> </itemfeedback> </item>