1.

Solve : (D2 – 6D + 25) y = 0

Answer»

The auxiliary equations is m2 – 6m + 25 = 0

\(m = {-6 \pm \sqrt{36-100} \over 2}\) 

= (6 \(\pm\) 8i)/2 

= 3 \(\pm\)4i

The Roots are complex and of the form, 

α ± β with α = 3 and β = 4 

The complementary function = e3x (A cos 4x + B sin 4x) 

The general solution is y = e3x (A cos 4x + B sin 4x)



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