SOLUTION: Please solve p: p^2=a^2+(a+d)^2+(a+2d)^2+(a+3d)^2+....+[a+(n-1)d]^2 for n=9, p=?

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Question 1008318: Please solve p:
p^2=a^2+(a+d)^2+(a+2d)^2+(a+3d)^2+....+[a+(n-1)d]^2
for n=9, p=?
Answer by ikleyn(52788) About Me  (Show Source):
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The general problem was just solved
in  http://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1008316.html.

So,  take the general formula and substitute  n=9  there.