Respuesta :

5x^2-(2x-3)^2x
=5x^2+-4x^2+12x+-9
=5x^2+-4x^2+12+-9
=(5x^2+4x^2)+(12x)+(-9)
=x^2+12x+-9

the final answer is..... x^2+12x-9

I hope this helps you out.