Question 346178
{{{4c^2-12c+9=0}}}

Oops! 
You're correct that is the answer. 
Sorry for screwing you up there.
(2c-3)(2c-3)=4c^2-6c-6c+9=4c^2-12c+9
I will correct it on the website too.
I could say I was just testing you but I just screwed up.
Good work!

{{{highlight(4c^2-12c+9=(2c-3)^2)}}}