How do you multiply ##(3x-2)^2##?

Apply foil method or the short cut method: Square the first term: ##(3x)^2=9x^2## Multiply the product of the first and last term by two: ##2(3x)(-2)=-12x## Square the last term: ##(-2)^2=4## Combine all the terms: ##9x^2-12x+4##