# Math Help - Help with simplifying an equation

1. ## Help with simplifying an equation

Hello,

I am wondering how this equation got from here:

$(y^3)(y + 1) - (y + 1) = 0$

to here:

$(y + 1)(y^3 - 1) = 0$

and what any relevant tips/rules might be. Thanks.

2. Originally Posted by NachoNacho
Hello,

I am wondering how this equation got from here:

$(y^3)(y + 1) - (y + 1) = 0$

to here:

$(y + 1)(y^3 - 1) = 0$

and what any relevant tips/rules might be. Thanks.
$(y^3)(y + 1) - {\color{red}1} (y + 1) = 0$
(y + 1) is common to each term on the left. Factorise in the usual way.