If f(n) = f( n-1 ) + 7 and f(1) = -18 then f(5) = ?

asked Dec 2, 2021 109k views

2 votes

by Palmi

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4 votes

Answer:

Explanation:

$f_n = f_n_-_1 + 7\\f_1 = -18\\f_2 = -18 + 7 = -11\\f_3 = -11 + 7 = -4\\f_4 = -4 + 7 = 3\\f_5 = 3 + 7 = 10\\$

A faster way is to take the common additive (7) times the difference in n, in this case (5-1 = 4)

$-18 + 7(4)\\-18 + 28\\10$

Capn Sparrow answered Dec 8, 2021

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