How do I "step by step" (nx)^2?

[Observeraren]

for example 3x^2 + (3x)^2 is 12x^2

But i don't remember how to brake down (3x)^2 step by step

 

[RUber]

You can distribute exponents across multiplication. $(AB)^2=A^2B^2.$

 

[Mark44]

$(3x)^2$ means two factors of 3x; i.e., 3x times 3x.

 

[member 587159]

(AB)² = (AB)*(AB) = ABAB = AABB = A²B²

 

[Observeraren]

Oh my, I had a gut feeling it would be something this simple that I've forgot! haha thanks a lot! ^^