If f(1) = 160 and f(n + 1) = –2f(n), what is f(4)?

Question

asked Sep 3, 2018 121k views

2 Answers

Matheus Lacerda · Answer 1 · 2018-09-09T17:27:57+0000

Answer with Step-by-step explanation:

f(1) = 160 and f(n + 1) = –2f(n)

⇒ f(2)= -2×f(1)

= -2×160

= -320

⇒ f(3)= -2×f(2)

= -2×(-320)

= 640

⇒ f(4)= -2×f(3)

= -2×640

= -1280

Hence, Value of f(4) is:

- 1280