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dydt+5y(t)=x(t)\frac{dy}{dt}+5y(t)=x(t)

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Q. dydt+5y(t)=x(t)\frac{dy}{dt}+5y(t)=x(t)
  1. Find Integrating Factor: We are given a first-order linear non-homogeneous differential equation of the form dydt+P(t)y=Q(t)\frac{dy}{dt} + P(t)y = Q(t), where P(t)=5P(t) = 5 and Q(t)=x(t)Q(t) = x(t). To solve this, we will first find the integrating factor, which is e(P(t)dt)e^{(\int P(t)dt)}. In this case, the integrating factor is e(5dt)=e5te^{(\int 5dt)} = e^{5t}.
  2. Multiply by Integrating Factor: Now we multiply the entire differential equation by the integrating factor e5te^{5t} to get e5tdydt+5e5ty(t)=e5tx(t)e^{5t} \cdot \frac{dy}{dt} + 5e^{5t} \cdot y(t) = e^{5t} \cdot x(t).
  3. Rewrite Differential Equation: Notice that the left side of the equation is the derivative of the product of the integrating factor and y(t)y(t), which is ddt(e5ty(t))\frac{d}{dt}(e^{5t} \cdot y(t)). So we can rewrite the equation as ddt(e5ty(t))=e5tx(t)\frac{d}{dt}(e^{5t} \cdot y(t)) = e^{5t} \cdot x(t).
  4. Integrate Both Sides: We will now integrate both sides of the equation with respect to tt. The left side becomes e5ty(t)e^{5t} \cdot y(t), and the right side requires integrating e5tx(t)e^{5t} \cdot x(t) with respect to tt, which we will denote as e5tx(t)dt\int e^{5t} \cdot x(t) \, dt.
  5. Solve for y(t)y(t): After integrating, we have e5ty(t)=e5tx(t)dt+Ce^{5t} \cdot y(t) = \int e^{5t} \cdot x(t) \, dt + C, where CC is the constant of integration.
  6. Solve for y(t)y(t): After integrating, we have e5ty(t)=e5tx(t)dt+Ce^{5t} \cdot y(t) = \int e^{5t} \cdot x(t) \, dt + C, where CC is the constant of integration.To solve for y(t)y(t), we divide both sides by e5te^{5t}, yielding y(t)=(1e5t)(e5tx(t)dt+C)y(t) = \left(\frac{1}{e^{5t}}\right) \cdot \left(\int e^{5t} \cdot x(t) \, dt + C\right).

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