In order to determine the expression that should be multiplied to n^2 to get 5n^3, divide 5n^3 by n^2. First for the numerical coefficient, 5 divide 1 is 5. For the variable n, n^3/n^2 is n. Thus, the term that should be multiplied to n^2 is 5n.
Absolute value makes everything inside the sign positive. Therefore, -|-12|=-12 |4-8|=|-4|=4 Therefore, -12-4=-16, But absolute value of that would be 16
