Question

Given f(x)=x^2 -3x, find f(2x) in simplest form.

so i got that you plug 2x in for x:
f(2x)=2x^2-6x

is that simplest form?
or should it be further condensed into 2x(x-6)?
thanks for your time i really appreciate it (:
Damon
f(2x) = (2x)^2 - 3 (2x)

= 4 x^2 - 6 x