## anonymous one year ago x to the 3rd power = 9 : rational or irrational x to the 3rd power = -343 :rational or irrational

1. misty1212

HI!!

2. misty1212

$x^3=9$ right?

3. anonymous

yep!

4. misty1212

then $$x=\sqrt[3]{9}$$ which is not a rational number

5. misty1212

on the other hand if $$x^3=-343$$ then $$x=\sqrt[3]{-343}$$ which you can compute here http://www.wolframalpha.com/input/?i=cube+root%28-343%29