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= - 12

Step-by-step explanation:

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

= - 2 - - 1 ← substitute in values

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

= - 2 - - 1 ← substitute values

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

= - 2 - - 1 ← substitute values

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