Question

Please help.
|-4b-8|+|-1-b^{2}|+2b^{3} ; b=-2

Answer 1

substitute b directly. :)
|-4(-2)-8|+|-1-(-2)^{2}|+2(-2)^{3}=?
|8-8|+|-1-4|+2(-8)=?
0 -5 -16=? -21 :)

Answer 2

Thank you!!