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Author Topic: TUT0601 Quiz4  (Read 4849 times)

jinshuyu

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TUT0601 Quiz4
« on: October 18, 2019, 02:11:14 PM »
This is the answer to my question
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jinshuyu

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Re: TUT0601 Quiz4
« Reply #1 on: October 18, 2019, 02:58:02 PM »
4y"+ 9y = 0

4r^2 + 9 =0

r^2=-9/4

r=+-(-9/4)^0.5

r=+-3/2i

y=c1cos3/2t+c2sin3/2t
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