## Precalculus (6th Edition)

$y=3^{x}-2$
This graph is a graph of $f(x)=b^{x}$, shifted down 2 units (the asymptote moved from y=0 to y=$-2)$. To find the original function, raising the graph upward, we move the points ($0,-1)$ to (0,1) (where we expect the graph of $f(x)=b^{x}$ to pass through). $(1,1) \rightarrow (1,3)\qquad 3=3^{1}$ $(2,7) \rightarrow (2,9)\qquad 9=3^{2}$, The original function was $f(x)=3^{x}$, shifted down 2 units, $y=f(x)-2=3^{x}-2$ $y=3^{x}-2$