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## Main Question or Discussion Point

Can someone please help me with very simple math.. and explain slowly how they got from

3(n+r)(n+r-1) + (n+r)

to (n+r)(3n+3r-2)?

I forgot how to factorise, so can someone help me do this please?

3(n+r)(n+r-1) + (n+r)

to (n+r)(3n+3r-2)?

I forgot how to factorise, so can someone help me do this please?