Factor completely.

121, minus, 81, x, squared
121−81x^2

1 answer

To factor completely, let's first consider the formats of the given terms:

121 is a perfect square (11²).
81x² can be factored as (9x)².

Using these factors, we can rewrite the expression as:
(11-9x)(11+9x)

So, 121 - 81x² factors completely as (11-9x)(11+9x).
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