Tap the fist number (which is y), tap the function key (such as y to the power of x), tap the second number (which is x), tap =. Example: 5 cubed would be entered as 5 "y to the x key" 3 = (answer 125). The cubed root of 125 woud be entered as 125 "x root of y key" 3 = (answer 5).Jun 15, 2012read more >>