Worked Solution #2 of 5, increasing in difficulty.

Expand the following:

\begin{align} \quad\quad\quad\quad\quad\quad\quad\quad\Large (x+1)\color{#0000FF} {(x-1)}\\ \\ &\cssId{Step1}{\Large =\color{#0000FF} { x}(x+1) \color{#0000FF} {- 1}(x+1)}\\ \\ &\cssId{Step2}{\Large = x^2+x - x-1}\\ \\ &\cssId{Step3}{\Large = x^2 - 1}\\ \\ \end{align}