SOLUTION: Find the sum <img src="http://i293.photobucket.com/albums/mm56/cool_user2004/8-1.png" alt="Photobucket

SOLUTION: Find the sum <img src="http://i293.photobucket.com/albums/mm56/cool_user2004/8-1.png" alt="Photobucket - Video and Image Hosting">

Question 172794: Find the sum

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Note: there are terms that need to be added.

Start with the given summation

Break up the summation

Since the 2nd term has no variables, we can simply multiply the inner value -5 by the number of terms 156

Multiply

Pull out the coefficient 4

Now this is where the formula comes in. There's one small problem though: the terms NEED to start at 1. So what this means is that we have to break into

Now use the formula

Add

Reduce

Multiply

Subtract

--------------------------------------------------

So the expression

then becomes

Multiply

Subtract

So this means that
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