3 because 3x3=9
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9 is the product of 3 * 3, or 3 squared.
9 x 9
When you square a number, you multiply it by itself. So, 9 squared means 9 multiplied by 9, which equals 81. In mathematical notation, 9 squared is written as 9^2 or 9 x 9.
(9x)2 = 81x2
5*n2