solve the equation(D²+5D+6)y=0
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(D²+5D+6) y=0
→ (D²+5D+6) =0/y
→ D²+5D+6=0
→D²+3D+2D+6=0
→ D(D+3) +2(D+3) =0
→ (D+2) (D+3) =0
→ (D+2) =0 OR (D+3) =0
→ D= -2 Or D= -3
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