How to calculate the square of 2A / the negative second power of 3B? Urgent! Is it the fourth power of 4A / the square of 9b? No, it's the square of 2A / the negative quadratic of 3B

How to calculate the square of 2A / the negative second power of 3B? Urgent! Is it the fourth power of 4A / the square of 9b? No, it's the square of 2A / the negative quadratic of 3B

The power of a negative number is the reciprocal
So [1 / (2a & sup2 / 3b)] & sup2;
=(3b/2a²)²
=9b & sup2; / (the fourth power of 4A)