What is the reverse of x = pow(y, 5)

Question

I must have a mental block, but I simply can't find the reverse of this math function:

x = pow(y, 5);

I have x and 5, how do I find y ?

Here is a snip of my current code:

+(float) linearVolumeToVolumeCurve:(float)volume
{
    return pow(volume, 5);
}

+(float) volumeCurveToLinearVolume:(float)volume
{
    return ???
}

Answer 1

Try this

Y=Math.Log(x) / Math.Log(5)