Question

how do i write f(x)= (2x-3)^2 in quadratic form

Answer 1

You need to expand it.
(2x-3)(2x-3)
Now use the FOIL method

Answer 2

4x^2-12x+9

Answer 3

ok, because its squared, you multiply itself two times:
(2x-3)(2x-3)

Answer 4

and like megafluff, said you use FIOL.