0008.ptx

<exercise masterit-seed="3005" masterit-slug="C3" masterit-name="Homogeneous second-order linear ODE">
  <statement>
    <p>Explain how to find the general solution to each given ODE using
        exponential functions.</p>
    <p>For each exponential solution using complex numbers, also provide
        an alternate general solution using only real numbers.</p>
    <ol>
      <li>
        <me> 18 \, {x} = -2 \, {x''} - 12 \, {x'} </me>
      </li>
      <li>
        <me> 2 \, {y''} = -58 \, {y} - 20 \, {y'} </me>
      </li>
    </ol>
  </statement>
  <answer>
    <me> {y} = c_{1} e^{\left(\left(2 i - 5\right) \, t\right)} + c_{2} e^{\left(-\left(2 i + 5\right) \, t\right)} </me>
    <me> {y} = {\left(d_{1} \cos\left(2 \, t\right) + d_{2} \sin\left(2 \, t\right)\right)} e^{\left(-5 \, t\right)} </me>
    <me> {x} = k_{1} t e^{\left(-3 \, t\right)} + k_{2} e^{\left(-3 \, t\right)} </me>
  </answer>
</exercise>