Homework Help: cubic function

Posted by L.P. on Wednesday, November 18, 2009 at 9:12pm.

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, Wednesday, November 18, 2009 at 9:20pm
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., Wednesday, November 18, 2009 at 9:25pm
okay sounds easy but I have a TI-84+ 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, Wednesday, November 18, 2009 at 9:44pm
yes, works for any root, or power.

If you dont have that key, you can do it with logs....

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