3个回答
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(2)
y''-4y'-5y=0
The aux. equation
p^2-4p-5=0
(p-5)(p+1)=0
p=5 or -1
y=Ae^(5x)+Be^(-x)
(4)
2y''+5y'-3y=0
The aux. equation
2p^2+5p-3=0
(2p-1)(p+3)=0
p=-3 or 1/2
y=Ae^(x/2)+Be^(-3x)
(6)
y''+8y'+16y=0
The aux. equation
p^2+8p+16=0
(p+4)^2=0
p=-4
y=(Ax+B)e^(-4x)
(8)
y''-6y'+10y=0
The aux. equation
p^2-6p+10=0
p=3/2+ i or 3/2 - i
y=e^(3/2)x .[ Acosx +Bsinx]
y''-4y'-5y=0
The aux. equation
p^2-4p-5=0
(p-5)(p+1)=0
p=5 or -1
y=Ae^(5x)+Be^(-x)
(4)
2y''+5y'-3y=0
The aux. equation
2p^2+5p-3=0
(2p-1)(p+3)=0
p=-3 or 1/2
y=Ae^(x/2)+Be^(-3x)
(6)
y''+8y'+16y=0
The aux. equation
p^2+8p+16=0
(p+4)^2=0
p=-4
y=(Ax+B)e^(-4x)
(8)
y''-6y'+10y=0
The aux. equation
p^2-6p+10=0
p=3/2+ i or 3/2 - i
y=e^(3/2)x .[ Acosx +Bsinx]
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