The rule for absolute values is.

1. If the number between the | | is positive, just replace the | | with ( ).
2. If the number between the | | is negative, change the sign of the
   number between them to positive and then change the | | to ( ).


3*(-3)^2-4|-3|+6

So change the -3 to 3 and the | | to ( )

3*(-3)^2-4(3)+6

Do the exponent first  (-3)^2 means (-3)(-3) = 9

3*9-4(3)+6

Do the 3*9 getting 27

27-4(3)+6

Do the multiplication 4(3) getting 12

27-12+6

Do the subtraction

15+6

Do the addition

21

Edwin