evaluate the expression | -3 |+ |-9 |

Question

please explain how this done

Answer 1

|-3| + |-9|
= 3 + 9
= 12

| | means we are taking absolute value. That means we do not care about negative signs if there are any.

Answer 2

Absolute value does not mean you don't care about signs. It means you only consider the integer's distance from 0 on the number line. By considering only the number's displacement from zero, it negates signs (+/-) and is treated as positive.