Answer:
See proof below
Step-by-step explanation:
We have to verify that if we substitute
in the equation
the equality is true.
Let's substitute first in the right hand side:

Now we use the distributive laws. Also, note that
(this also works when the power is n-2).



then the sequence solves the recurrence relation.
The answer to this question is:
y = -2x - 1
vaka laka vakanlaka vaka laka
(replace the variables) 6(9)-2(5)^2
(simplified) 54-10^2.... 54-100=-46