What is b (give equation) if (a+b)^c=x .

Doesn't this go in math? -a + x^1/c

Furthermore, this looks an awful lot like homework.

I guess so... okay, to redeem myself, the winner gets a prize. Edit: A loophole.
Math & Science
We won't do your homework for you.

Correct. However, there should be a simpler answer.

Why would there be a simpler answer? That appears correct to me. Unless you start giving us the values for the variables, but then you've defeated the point.

I know it is correct, so I guess Du'deman wins. Everyone else, you fail.

Unless there's a you-fail-website that uses HTML5, I doubt anyone will consider such an insult.