Toronto Math Forum
MAT244--2019F => MAT244--Test & Quizzes => Quiz-4 => Topic started by: Mengyuan Wang on October 19, 2019, 04:46:15 PM
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4y'' + 12y' + 9y = 0
let y = e^rt
y' = re^rt
y''= r^2e^rt
4r^2 + 12r +9r = 0
r = -(2/3)
thus
y = c1e^(-(2/3))t + tc1e^(-(2/3))t