Answer:
(2x - 3)(2x + 3)
Step-by-step explanation:
Given
4x² - 9
This is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
4x² = (2x)² ⇒ a = 2x
9 = 3² ⇒ b = 3, thus
4x² - 9 = (2x - 3)(2x + 3) ← in factored form
