If anyone can check my work for me that would be greatly appreciated I'm having trouble.

Question

Evaluate the expression foe the given value of the variable.
|-4b-8|+|-1-b^2|+2b^3 ; b=-2

I got 1 for my answer
-4(-2)-8-1+2^2+2(-2)
8-8-1+2^2-4
-1+2^2-4
1

Answer 1

|-4(-2)-8| + |-1-(-2)^2| + 2(-2)^3
|-4(-2)-8| + |-1-4| + 2(-8)
|8-8| + |-1-4| - 16
0+5-16
-11

Answer 2

Can somebody please help me with solving this and show steps if they can. Solve the equation. Check for extraneous solutions. 9|9-8X|=2X+3

For my answer I got X=-1
I divided by 9 on both sides I got 8X=2X-6
Then I divided by 6 on both sides and got X=-1

Answer 3

If you went from
9|9-8x|=2x+3
to
8x=2x-6
you certainly did not divide by 9 (on BOTH sides)!

All absolute-value problems have two possibilities.

First,
9(9-8x)=2x+3
81-72x = 2x+3
78 = 74x
x = 39/37

Second,
9(9-8x) = -(2x+3)
81-72x = -2x-3
70x = 84
x = 6/5