14-
01-
15
Which of the following is an integra6ng factor
for 3y + 6ty = 8t?
A.
e2 t
B.
e2t
C.
e 2t
D.
et
E.
Which of the following is an integra6ng factor
for y+2y = 3t?
A. e2t
B. e2t+5
C. e2 e2t
D. 7 e2t
E.
14-
01-
22
This weeks topics:
Systems of dieren<al equa<ons
Eigenvalue/vector method for solu<on
Introduc<on to vector eld pictures for 2D
systems
Reading: Lebl 3.1-
3.5
Linear systems of ODE:
To solve linear sys
14-
01-
27
Midterm
Thursday, 6.45pm-
7.45pm WESB 100
No calculators, notes, books, phones/devices
List of topics on website
Make sure you can do all the HW problems
AddiLonal review problems from book are given
14-
01-
10
What is the solu0on to the equa0on:
y = 2 x y
Midterm tests
January 30th, 6.45pm-
7.45pm, WESB 100
February 27th, 6.45pm-
7.45pm, WESB 100
March 27th, 6.45pm-
7.45pm, WESB 100
IMPORTANT: If you ca
14-
01-
24
Homework Policy
Quite a few people wanted their HW re-
graded.
Policy for this:
Please read the soluAons before considering such a
request.
Each wriEen HW is worth approximately 1% of your
nal grade
14-02-03
1.0
Iden,fy the vector
eld for:
A
0.5
0.0
0
~ (t) =
x
-0.5
-1.0
-1.0
-0.5
0.0
0.5
1
3
2
3
~
x
1.0
1.0
1.0
0.5
0.5
B
C
D: none of
the above
0.0
0.0
-0.5
-0.5
A dog is ,ed to a tree at (0,0). It gets excited and