Part 3 --- Power series method and Matrix method

2 more techniques for solving DEs --- power series & matrix method. They are kinda long 🫩 0:00 power series 1:45 how to combine series 10:53 constant term is 0 and recurrence relation 13:39 how to get enough non zero terms 24:51 matrix method 25:38 matrix method case 1 example (2 real roots) 37:26 matrix method case 2 example (1 real root) 44:20 matrix method case 3 example (2 complex roots) 😱 52:35 non homogeneous matrix method (with undetermined coefficient) 😭