Answer:
Since both terms are perfect squares, factor using the difference of squares formula,
a
2
−
b
=
(
+
)
where
3
x
and
1
.
Step-by-step explanation:
(3x - 1)(3x + 1)
9x² - 1 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
9x² - 1
= (3x)² - 1² ← with a = 3x and b = 1, thus
= (3x - 1)(3x + 1)
