SOLUTION: Find the nth partial sum of the arithmetic sequence. an = 2n − x; n = 19

SOLUTION: Find the nth partial sum of the arithmetic sequence. an = 2n − x; n = 19

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Question 1178676: Find the nth partial sum of the arithmetic sequence.
an = 2n − x; n = 19
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

Find the nth partial sum of the arithmetic sequence.
given:

the nth partial sum formula of the arithmetic sequence:

find first term:

so,
substitute
=>
=>
=>

go to

.........substitute and

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