For example: $\ x^2$ is the sum of the terms of $2x-1 $ (1+3+5+7)
Would that be written like: $\ \sum^{t}_{x=1} 2x-1=x^2$
$\ t$ being the whatever term.
For example: $\ x^2$ is the sum of the terms of $2x-1 $ (1+3+5+7)
Would that be written like: $\ \sum^{t}_{x=1} 2x-1=x^2$
$\ t$ being the whatever term.
$\sum_{n=0}^{x-1} (2n+1)=1+3+5+\cdots+(2x+1)=x^2$
because $n=0$ initially and the sum ends when $n=x$.