Prove it

[BobbyJones]

I got quite stuck on where to begin with this question, please have a look and shed some light if you can.

Prove that:

2(2x-3)^5/2 - 3x(2x-3)^1/2 + x^2(2x-3)^1/2 is equilalent to 3(x-2)(x-3)(2x-3)^1/2