9231 P23 - Jun 2020 - Q1 - 6 marks
6039
Find the general solution of the differential equation
\[\frac{\mathrm{d}^{2} x}{\mathrm{~d} t^{2}}-8 \frac{\mathrm{~d} x}{\mathrm{~d} t}-9 x=9 \mathrm{e}^{8 t}\]
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