1. ## algebraic steps

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.

2. Hi there.

Do you mean:

$\frac{n(n+1)}{2}+(n+1)$ ?

If so, you can't change it to $n(n+1)+\frac{2(n+1)}{2}$, as the first term is now different.

You could however change it to $\frac{n(n+1)}{2}+\frac{2(n+1)}{2}$, as you are just multiplying the second term by $\frac{2}{2}$ which equals $1$.

Hope this helps

3. it does, thank you