4 x 5 = 20
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16
If X squared is less than 16, then the absolute value of X is less than the square root of 16. X will be greater than -4 and less than +4.
16 is greater than 13 but negative 16 or -16 is less than negative 13 or -13. The larger the negative number the smaller is its value..
6
x can be any number greater than 16 and less than 81.