Trouble checking radicals on calculator

[Malysa]

How do I check this on my calculator. Im using the calculator on my iphone

386 and negative2/3rd power ~0.019

 

[mmm4444bot]

I do not have the User Manual for your iphone.

Here's how my cell's calculator software accepts it (very standard):

386^(-2/3)

 

[lookagain]

The following is a rewrite using appropriate numbers of decimals from a calculator
(extra digits hidden from the display) to justify the next approximation:


\(\displaystyle \left(\sqrt[3]{\dfrac{1}{386}}\right)^2 \)



\(\displaystyle \approx \ \left(\sqrt[3]{.002590674}\right)^2 \)



\(\displaystyle \approx \ (0.137342273)^2 \)



\(\displaystyle \approx \ 0.0188629 \)



\(\displaystyle \approx \) 0.019.

There was too much rounding in a couple of the steps from the original
post in #4.