A sequence is defined by the recursive formula f (n + 1) = f(n) – 2. If f(1) = 18, what is f(5)?

A sequence is defined by the recursive formula f (n + 1) = f(n) – 2. If f(1) = 18, what is f(5)?

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We know that the first term is $18.$

\( f(1)=18 \)

\( f(2)=f(1)−2=18−2=16 \)

\( f(3)=f(2)−2=16−2=14 \)

\( f(4)=f(3)−2=14−2=12 \)

\( f(5)=f(4)−2=12−2=10 \)

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