If the car spends 3 hours going 55 miles per hour on the trip, how long does it spend going 35 miles per hour ?
1 answer:
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Answer:
Step-by-step explanation:
It is a linear homogeneous differential equation with constant coefficients:
y" + 4y = 0
Its characteristic equation:
r^2+4=0
r1=2i
r2=-2i
We use these roots in order to find the general solution: