729.
1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1
1, 3, 9, 27, 81. 1 x 81 = 81, 3 x 27 = 81, 9 x 9 = 81.
To factorize (x^2 - 81), recognize that it is a difference of squares. It can be expressed as ((x - 9)(x + 9)) because (81) is (9^2). Therefore, the factorization of (x^2 - 81) is ((x - 9)(x + 9)).
1 x 81, 3 x 27, 9 x 9 = 81
81 = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
81 = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1
1, 3, 9, 27, 81: 1 x 81, 3 x 27, 9 x 9.
27
1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1 = 81
9 x 9 = 81
81 9*9=8181
81 is a perfect square. 9 x 9 = 81