Once we know the form of the solution by analyzing the roots of the
characteristic equation, we can solve for the unknown coefficients in the
differential equation via the initial conditions of the circuit.
For example, if the roots are real and distinct, and v(t) = A1es1t + A2es2t
The initial voltage across the capacitor at t = 0: 10 = A1 + A2
The initial current through the capacitor =
-(10/R + 2) = C dv/dt = C [A1s1es1t + A2s2es2t] = C [A1s1
+ A2s2]