The absolute value of a number refers to its distance from zero on the number line, regardless of direction. Therefore, the absolute value is always non-negative.
In the case of 9, since it is already a positive number, its absolute value is simply 9 itself. To put it simply, we can express it as:
|9| = 9
This same principle applies to negative numbers, such as -9, where the absolute value would be 9 as well, since it is also 9 units away from zero. So, whether a number is positive or negative, its absolute value gives us a measure of its magnitude.