Math

Evaluate the expression for the given value of the variable. Show your work.

[-4b-8]+[-1-b^2]+2b^3;b=-2



Solve the equation. Check for extraneous solutions. 9[9-8x]=2x+3. Show your work.



I really need help with both of these problems.

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  1. If b = -2, then since
    (-2)^2 = (-2)(-2) = +4
    (-2)^3 = (-2)(-2)(-2) = -8

    [-4b-8]+[-1-b^2]+2b^3
    = [-4(-2)-8]+[-1-(-2)^2]+2(-2)^3
    = [8-8]+[-1-4]+2(-8)
    = 0-5-16
    = -21

    9[9-8x] = 2x+3
    81-72x = 2x+3
    78 = 74x
    x = 78/74 = 39/37

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