The characteristic equation
Substituting $y = e^{rx}$ turns $ay'' + by' + cy = 0$ into a quadratic, and two distinct real roots give the whole general solution.
About 35 minutes8 activities Paper packet
Substituting $y = e^{rx}$ turns $ay'' + by' + cy = 0$ into a quadratic, and two distinct real roots give the whole general solution.
About 35 minutes8 activities Paper packet