## Algebra 1

$(1+\sqrt 5)*n/2 - n$
The golden ratio is $(1+\sqrt 5)/2$. This is a ratio of length to width. Let width = $n$ and let $x$ be the amount needed to make the golden rectangle. $(1+\sqrt 5)/2 =$(x+n)/n(1+\sqrt 5)*n/2 = x+n(1+\sqrt 5)*n/2 - n = x\$