Answer:
Step-by-step explanation:
Given is a non homogeneous second degree equation as
Auxialary equation is
Hence general solution is
x = Acos 2t + B sin 2t
Particular integral is =
Since t has coefficient 1, we substitute
Hence full solution is
J
-66
a1 = 2
n = 18
d = - 4
a18 = a1 + (n - 1) * d
a18 = 2 + (18 - 1)*(-4)
a18 = 2 + 17*-4
a18 = 2 - 68
a18 = -66
Answer: A
Solution :
put x = -1
Now, put x = 1
here :