Solving initial value problem using Laplace transform

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Homework Statement
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Relevant Equations
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For this problem,
Printed problem statement reading: 6. Find the solution of the given initial value problem:

Problem statement: y'' + 3y' + 2y = f(t) with y(0) = 0, y'(0) = 0, where f(t) is piecewise: 1 for 0 ≤ t < 10, and 0 for t ≥ 10.

I'm confused how,
Handwritten-style typeset solution: f(t) = 1 - H(t - 10) for any t >= 0 highlighted in orange; Laplace transform equation s^2 Y(s) + 3s Y(s) + 2Y(s) = 1/s - e^(-10s)/s; and Y(s) = 1/(s(s^2+3s+2)) - e^(-10s)/(s(s^2+3s+2)); with inverse transform L^-1[U(s)e^(-as)] = H(t-a)u(t-a).

However, not sure how to go from here.
$$
f(t) = \begin{cases}
1 & \text{if } 0 \leq t < 10\\
0 & \text{if } t \geq 10

\end{cases}
$$
By definition Heavside function is,
$$
H(t - 10) = \begin{cases}
1 & \text{if } t < 10\\
0 & \text{if } t \geq 10


\end{cases}




1 - H(t - 10) = 1 - \begin{cases}
1 & \text{if } t < 10\\
0 & \text{if } t \geq 10


\end{cases}
$$
However, I don't know where to go from here. Does anybody please know?

Thanks for any help!