A sequence is defined recursively using the formula f(n+1)=-0.5f(n). If the first term on the sequence is 120, what is f(5)

asked Dec 12, 2018 113k views

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F(n+1)=-0.5f(n) 120 f (5)

Romeo Valentin answered Dec 14, 2018

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$f(n+1)=-0.5f(n)\\ f(1)=120\\\\ f(2)=-0,5\cdot120=-60\\ f(3)=-0,5\cdot(-60)=30\\ f(4)=-0.5\cdot 30=-15\\ f(5)=-0.5\cdot(-15)=7.5$

Subramn answered Dec 16, 2018

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