#### Answer

$$y=5+c e^{4t},c\lt 0$$

#### Work Step by Step

The solution of $y'=4(y-5)$ is
$$y=5+c e^{4t}.$$
Where $c\lt 0$ to make $y\to - \infty$ as $t\to \infty$.

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

$$y=5+c e^{4t},c\lt 0$$

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