Well there you have it. I do not know summation techniques. That's what I need to study.. Thanks. It is much easier when i understand the correct terminologies and terms so i can have easier means to reference or look it up. Half of my problems in mathematics is not knowing what to look for...
What is the procedure for finding the unknown term(end value in this scenario) in a series? For example
\sum_{r=1}^{n}{2r+3}
My Attempt was to simply state the first four terms and then simply add the nth term as it is:
2(1)+3=5
2(2)+3=7
2(3)+3=9
2(4)+3=11
2(n)+3=2n+3...
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