SOLUTION: Pleas help me answer this problem : In an arithmetic progression.The sum of the first three terms is 18,and the sum of the squares of these terms is 126,Find the terms.
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Question 703202: Pleas help me answer this problem : In an arithmetic progression.The sum of the first three terms is 18,and the sum of the squares of these terms is 126,Find the terms.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
= common difference
= second term (I think that may make it easier)
first term =
third term =
The sum of the first three terms is
--> -->
The sum of the squares of these terms is
--> --> --> -->
There are two solutions:
either or
Either way, the terms are
, and
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