The given expression, 9X^2 - 121, is a difference of squares.
We can rewrite 121 as (11)^2.
So, 9X^2 - 121 = (3X)^2 - (11)^2.
According to the identity, a^2 - b^2 = (a + b)(a - b),
we can factor 9X^2 - 121 as (3X + 11)(3X - 11).
Therefore, the expression 9X^2 - 121 is factorized as (3X + 11)(3X - 11).
Factor fully: 9X^2-121
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