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

Risposta:

f(4)=-1280

Spiegazione:

As f(1)=160 e f(n+1)=–2f(n)

f(2)=-2f(1)=-2xx160=-320

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

f(4)=-2f(3)=-2xx640=-1280

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