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in this video were going to go over the summation formulas that you need to know in calculus particularly if you want to find the area of a region so lets say if we wish to evaluate this sum so its given to us using sigma notation so what is this equal to now there is a formula for this type of problem if you have a constant c and if i is equal to one and it goes up to n then its going to equal the constant times n in this case were adding eight four times so the constant is eight so therefore adding eight four times is the same as multiplying eight by four and this will give you 32. now lets work on some other examples try these two problems lets say i is one the constant is seven and this is eight and also lets say this is nine and this is five so the first one is simply going to be c times n seven times eight so thats 56 for the second example its going to be c times n or nine times five which is forty five so thats how you can evaluate a sum if you have a constant in sig