differentiate: f(x)= (x-3)^2/ (2x+3)^3

f(x)= (x-3)^2/ (2x+3)^3; differentiate:

The differentiate of this function respect to x is:

((2x+3)

^{3}* 2(x-3)*1 - (x-3)^{2}* 3*(2x+3)^{2}* 2)/ ((2x+3)^{3})^{2})making all the operations it gives:

(-2x

^{2 }+42x -72)/((2x+3)^{4})CHECK!!!!!!!!!!!!!!!!