|-4b-8| |-1-b^2| 2b^3;b=-2

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24-09-2014
Mathematics

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|-4b-8| |-1-b^2| 2b^3;b=-2

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Illuminati750 Illuminati750 · Answer 1 · 2014-09-24T19:16:46+02:00

Illuminati750 Illuminati750

24-09-2014

Hello,

We know that:
|a|=a
|-a|=a

then:

[tex]|-4b-8|*|-1-b^2|*2b^3 \\ \\ Replacing: \,\,b=-2 \\ \\ = |-4(-2)-8|*|-1-(-2)^2|*2(-2)^3 \\ =|8-8|*|-1-4|*2(-8)\\ =|0|*|-5|*(-16) \\ =5*(-16) \\ \boxed{=-80}[/tex]

Answer: -80

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