Question

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

Answer 1

Answer:

-1280

Step-by-step explanation:

Put n=1

f(2)=-2f(1)

f(2)=-2*160=-320

Put n=2 we get

f(3)=-2f(2)=-2*(-320)=640

Now put n=3 we get

f(4)=-2f(3)=-2*640=-1280

So Hence f(4)=-1280

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