[SOLVED] Cube rooting?

[matty]

How would i do a sum that includes a cube root??

 

For example

 

125 cube rooted?

 

I tried

$sum = 3^125;

 

But nothing... Can you guys help?

 

Thanks, Matt

 

[Lumio]

<?php
$num = 3;
$n = 3;
$p = 125;
for($i=2; $i<=p; $i++)
   $num *= $n;

echo $n;
?>

[matty]

It doesn't work... It gives me 3 when I'm looking for 5.

 

EDIT - In fact it gives me three for any number.

[DLR]

Hi there,

 

Cube root is just a number multiplied by itself 3 times, so possibly

 

$answer = $num*$num*$num;

 

would do?

 

David

[matty]

I know, but I want to get the cube root from 125 which is 5, but say I don't know that..

 

what you posted would work if i wanted to get the cube of 5 but not the cube root from 125...

 

If you get me?

[matty]

Never mind... sorted it myself now.. This was what i was looking for

 

$sum = pow(125, 1/3);