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Algebra help! Am I missing something?

Hi guys,
Newbie here, 3rd year maths graduate student,
Struggling on this, where I've marked with the red lines, how did they get it? Am I missing something totally basic and obvious here?
Thanks in advance
image.jpeg
Original post by Ahsaan786
Hi guys,
Newbie here, 3rd year maths graduate student,
Struggling on this, where I've marked with the red lines, how did they get it? Am I missing something totally basic and obvious here?
Thanks in advance
image.jpeg

Just standard factorisation.
they have just brought 1/6n(n+1) out of both sections as a factor

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