1.

Solve (D2 + 2D + 3) y = 0  differential equations.

Answer»

The auxiliary equations A.E is m2 + 2m + 3 = 0 

⇒ m2 + 2m + 1 + 2 = 0 

⇒ (m + 1)2 = -2 

⇒ m + 1 = ± √2i 

⇒ m = – 1 ± √2i 

It is of the form α ± iβ 

The complementary function (C.F) = e-x [A cos √2 x + B sin √2 x] 

The general solution is y = e-x [A cos √2 x + B sin √2 x]



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