(3х-2)(3х+2)(9х²+4)

To multiply the given expressions, first expand the first two expressions using the distributive property:

(3x - 2)(3x + 2) = 3x * 3x + 3x * 2 - 2 * 3x - 2 * 2 = 9x² + 6x - 6x - 4 = 9x² - 4

Next, multiply the result with the third expression:

(9x² - 4)(9x² + 4) = 9x² * 9x² + 9x² * 4 - 4 * 9x² - 4 * 4 = 81x^4 + 36x² - 36x² - 16 = 81x^4 - 16

So, the final result of the multiplication is 81x^4 - 16.