cubic function
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?

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. 
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? 
yes, works for any root, or power.
If you don't have that key, you can do it with logs....