SOLUTION: In an AP, the sum of the first three terms is 18, and the sum of the squares of these terms is 126. Find the three terms.

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Question 892520: In an AP, the sum of the first three terms is 18, and the sum of the squares of these terms is 126. Find the three terms.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b+c=18,
a^2+b^2+c^2=126,
b-a=d
c-b=d
a = 3, b = 6, c = 9, d = 3
or
a = 9, b = 6, c = 3, d = -3