Hoping someone can help me here. I'm taking an online high school math course, and I'm unsure I'm doing one of the questions right, and can't find a similar problem anywhere. Simplify this equation:

After going through a bunch of steps including expanding, simplifying, laws of exponents, etc, I've come up with a final answer of x^(3b^2). I'd show my work except I stink at formatting, but I'll try if anyone thinks it would be helpful!

Thanks in advance!