Question

I don't understand this question.

Answer 1

Answer:

$c_{5}$ = - 12

Step-by-step explanation:

To find the 5 th term in the sequence, calculate the 3 rd and 4 th terms, that is

$c_{3}$ = - 2$c_{2}$ - $c_{1}$ - 1 ← substitute in values

   = - 2(1) - 2 - 1 = - 2 - 2 - 1 = - 5

$c_{4}$ = - 2$c_{3}$ - $c_{2}$ - 1 ← substitute values

   = - 2(- 5) - 1 - 1 = 10 - 1 - 1 = 8

$c_{5}$ = - 2$c_{4}$ - $c_{3}$ - 1 ← substitute values

   = - 2(8) - (- 5) - 1 = - 16 + 5 - 1 = - 12