Hello, I cannot recall my algebra.
how does this go from
n(n+1)/2 +(n+1)
to
n(n+1) + 2(n+1)/2
I'm missing a step in between. Can anyone show me? thank you.
Hi there.
Do you mean:
$\displaystyle \frac{n(n+1)}{2}+(n+1)$ ?
If so, you can't change it to $\displaystyle n(n+1)+\frac{2(n+1)}{2}$, as the first term is now different.
You could however change it to $\displaystyle \frac{n(n+1)}{2}+\frac{2(n+1)}{2}$, as you are just multiplying the second term by $\displaystyle \frac{2}{2}$ which equals $\displaystyle 1$.
Hope this helps