Soru
(1 point) Find the solution to the following recurrence: a_(n)=-8a_(n-1)-12a_(n-2)+441n for ngeqslant 2 with initial conditions a_(n)=
Çözüm
4.5
(376 Oylar)
Rıdvan
Uzman · 3 yıl öğretmeni
Uzman doğrulaması
Cevap
To solve the given recurrence relation, we can use the method of solving linear homogeneous recurrence relations with constant coefficients.The given recurrence relation is:
for
We can rewrite this as:
Now, let's assume a solution of the form
, where
is a constant.Substituting this into the recurrence relation, we get:
Dividing both sides by
, we get:
Now, we can solve this quadratic equation to find the values of
.The quadratic equation is:
Solving this equation, we get:
and
Now, we can write the general solution of the recurrence relation as:
To find the values of
and
, we can use the initial conditions.Let's assume
and
as initial conditions.Substituting these values into the general solution, we get:
Solving this equation, we get:
Now, we can substitute this value of
into the general solution:
Simplifying this expression, we get:
To find the value of
, we can use the initial condition
.Substituting
into the expression for
, we get:
Solving this equation, we get:
Therefore, the solution to the given recurrence relation is:
So, the final answer is
.