zohal05lsa zohal05lsa

25-09-2020
Mathematics

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find the sum of the first 9 terms of the arithmetic series given that f(n)=7n-17

Respuesta :

mhanifa mhanifa

25-09-2020

Answer:

162

Step-by-step explanation:

Given AP

f(n)=7n - 17
S₉ = ?

Solution

Using formula Sₙ = 1/2n(f(1) + f(n))

f(1) = 7*1- 17 = -10
f(9) = 7*9 - 17 = 46
S₉ = 1/2*9*(-10 + 46) = 162

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