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The repeated roots case occurs when the discriminant $b^2 - 4ac$ is zero, causing the two characteristic roots $r_1$ and $r_2$ to be identical ($r_1 = r_2$). The video identifies this as a distinct scenario where the standard linear combination of two exponentials $c_1 e^{rt} + c_2 e^{rt}$ collapses to a single term, requiring a more involved solution method (typically involving a $t e^{rt}$ term) which is deferred to a later video.

Conditions: The discriminant $b^2 - 4ac = 0$.; $r_1 = r_2$.

The repeated roots case occurs when the discriminant $b^2 - 4ac$ is zero, causing the two characteristic roots $r_1$ and $r_2$ to be identical ($r_1 = r_2$). The video identifies this as a distinct scenario where the standard linear combination of two exponentials $c_1 e^{rt} + c_2 e^{rt}$ collapses to a single term, requiring a more involved solution method (typically involving a $t e^{rt}$ term) which is deferred to a later video.

Conditions: The discriminant $b^2 - 4ac = 0$.; $r_1 = r_2$.