Posted by L.P. on .
I am absolutly stumped at how to solve this. I know for squared functions you take the square root of both sides to solve for x but what about if one side is cubed. I know you would have to take the cubed root of the function but how do you do this on a calculator?
equation is: 3.9*10^11 = 4*X^3
so I simplify and get:
9.75*10^12 = x^3
but now how to solve on calculator?

cubic function 
bobpursley,
the x^{y} key allows cube roots.
( some calc have it as y^{x} key)
for instance, the cube root of 27
enter 27
press x^{y}
enter (1 divide 3 )
you should see 3, and some will require you to press enter. 
cubic function 
L.P.,
okay sounds easy but I have a TI84+ and I don't see that key.
also will this work for say x^5 or x^4?
If you don't have this key how would you solve it? 
cubic function 
bobpursley,
yes, works for any root, or power.
If you don't have that key, you can do it with logs....