Equation not formatting correctly

I know I'm doing something wrong but I don't know what.

1.

The first portion works fine but for some reason the second part will not go directly on top of the horizontal line. Also I have been having difficulty putting the second part of the equation underneath the first part (starting new line) I tried the "\\" but it didn't work for me.

Here's the codes

1. [tex]\frac{(b^{1/2})^2}{(16b^6)^{1/2}}

= \frac{b^{1/2*2}}{16^{1/2}b^{6*1/2}}

Any comments are appreciated!

Thanks,