Let f ( x ) = x − 1 {\displaystyle f(x)={\sqrt {x}}-1} and g ( x ) = ( f ∘ f ) ( x ) {\displaystyle g(x)=(f\circ f)(x)} . Find a formula for g ( x ) {\displaystyle g(x)} in terms of x {\displaystyle x} (in other words, your formula should not use the symbol “ f {\displaystyle f} ”).
