[Do not use Laplace transforms here-] (c) %" +21f" + 10y =ell
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Substituting this into the equation, we get: %e^(rt) + 21fe^(rt) + 10e^(rt) = 0 Dividing by e^(rt), we get the characteristic equation: % + 21f + 10 = 0 Solving for f, we get f = (-21 ± sqrt(441 - 40%))/20. Since % is not given, we cannot solve for f explicitly, Show more…
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