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