Multiply. \[ (3 x-2)(3 x+2) \] $(3 x-2)(3 x+2)=\square($ Simplify your answer.)

Step 1 ：Given the expression \((3 x-2)(3 x+2)\), we need to simplify it.

Step 2 ：First, we apply the distributive property, which states that \(a(b + c) = ab + ac\) and \(a(b - c) = ab - ac\).

Step 3 ：Applying this to our expression, we get \(9x^2 - 4\).

Step 4 ：Final Answer: The simplified form of the expression \((3 x-2)(3 x+2)\) is \(\boxed{9x^2 - 4}\).