Please help me! Will fan and give medal.
Evaluate the expression for the given value of the variable.
|-4b-8| + |-1-b^2| + 2b^3; b=-2

Question

Please help me! Will fan and give medal.
Evaluate the expression for the given value of the variable. 
|-4b-8| + |-1-b^2| + 2b^3; b=-2

kirbykirby · Answer

$ |-4(-2)-8| + |-1-(-2)^2| + 2(-2)^3$

$ = |8-8|+|-1-(4)|+2(-8) $ can you figure the rest?

love_to_love_you · Answer

No, that's why I am asking for help. I have a really bad teacher :/

kirbykirby · Answer

Ok Well, just to be sure.. is there anything you didn't understand in the 2nd line I wrote?

What I simplified was: $-4(-2)=8$
$(-2)^2=4$
$(-2)^3=-8$

love_to_love_you · Answer

No i understood it

kirbykirby · Answer

perfect, the next steps should be fairly simple then. 

$ = |8-8|+|-1-(4)|+2(-8)$

$ =|0|+|-1-4|-16\
=0+|-5|-16\
=5-16\
=-11$

This is because: any number between absolute value bars | | will be a positive number. For example: |-5| = 5, and |5| = 5
|-2| = 2, etc...