(3х-2)(3х+2)(9х²+4)

To multiply the given expressions, we will use the distributive property and multiply each pair of expressions first, and then multiply the resulting expressions together.

First, let's multiply the first two expressions:

(3x - 2)(3x + 2) = 9x^2 + 6x - 6x - 4 = 9x^2 - 4

Now, let's multiply the result with the third expression:

(9x^2 - 4)(9x^2 + 4) = 81x^4 + 36x^2 - 36x^2 - 16 = 81x^4 - 16

Therefore, the final result of the expression (3x - 2)(3x + 2)(9x^2 + 4) is 81x^4 - 16.