Respuesta :

GooberSquat
Your Answer would be:

4x2 – 9 = (2x - 3)(2x + 3)

Hope this helps!
Here: Root of 4x² is 2x and of 9 is 3, 
So, it would be simply: 4x² - 9 = (2x - 3)(2x + 3)

In short, Your Answer would be: (2x - 3)(2x + 3)

Hope this helps!