Question

Write x'" = x + t as a first order system

Answer 1

y = x'

z = y'

z' = x + t

Explanation:

Hi!

You need to define two new variables y and z:

y = x'

z = y'

Then:

z = y' = x''

z' = x''' = x + t

Now you have a system of 3 equations with only first derivatives