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Find the sum of the first 25 terms of the arithmetic sequence -2, 2, 6, 10, 14...

Find the sum of the first 25 terms of the arithmetic sequence -2, 2, 6, 10, 14...
asked 183k views
1 vote
Find the sum of the first 25 terms of the arithmetic sequence -2, 2, 6, 10, 14...

asked
User Joe Fratianni
by
8.6k points

1 Answer

2 votes

Answer:

1150

Explanation:

a2=a1+d

d=4

sn=(n/2)(2a1+(n-1)d)

s25=(25/2)(2×(-2)+24×4)=25×46=

1150

answered
User EfrainReyes
by
7.9k points
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