Answer: 88.74
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
Answer:
a.
b
Step-by-step explanation:
1.
Auxillary equation


D=2,2
Then complementary solution =
Particular solution 
D is replace by D+2 then we get
P.I=
P.I=
where V is a function of x
P.I=
By integrating two times
Hence, the general solution

b.y''+9y=5 cos x-7 sin x
Auxillary equation

D=

P.I=
P.I=
Then D square is replace by -a square
is replace by - then we get
P.I=-5 cos x+7 sin x
The general solution

may I ask if these questions' answer are always 2... or they can be other numbers too