Question

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If f(1)=10 and f(n)=-2f(n-1) then find the value of f(5)

Answer 1

9514 1404 393

Answer:

f(5) = 160

Explanation:

The first several terms of the sequence are ...

10, -20, 40, -80, 160, -320, 640, ...

Each term is -2 times the previous term.

f(5) = 160