Toronto Math Forum

MAT244--2019F => MAT244--Test & Quizzes => Quiz-4 => Topic started by: Mengyuan Wang on October 19, 2019, 04:46:15 PM

Title: Quiz 4 TUT0202
Post by: Mengyuan Wang on October 19, 2019, 04:46:15 PM
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