Question 668458
Graph {{{y = 2^x}}} (in green) to get this


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,0,2^x)

)}}}


Now flip the given graph over the line y = x to get inverse graph {{{y = log(2,(x))}}} (in blue)


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,0,2^x,log(2,x))

)}}}