M408D SPRING 2015 HOMEWORK #4 (1) - cheatham(sc36975 HW04...

cheatham (sc36975) – HW04 – um – (53890) 1
This print-out should have 14 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
001 10.0 points
Find all values of r for which the function
y = e
rt
satisfies the di ff erential equation
y
′′
− 2 y
′
− 8 y = 0 .