A tutorial on to find the inverse of a function given by a formula. From www.analyzemath.com

see also

http://www.analyzemath.com/stepbystep_mathworksheets/functions/inverse_square_root.html

http://analyzemath.com/stepbystep_mathworksheets/functions/inverse_linear.html

http://analyzemath.com/stepbystep_mathworksheets/functions/inverse_cubic.html