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**1. The problem statement, all variables and given/known data**

arctan(8x-8)=-1

**2. Relevant equations**

I'm sure what this part wants.

**3. The attempt at a solution**

tan[arctan(8x-8)]=tan(-1)

8x-8=tan(-1)

x=(1/8)(tan(-1)+8)

x=(1/8)(-(tan(1)+8)

x=

I am stuck on the last part since the homework says Simplify the above equation. (Round your answers to three decimal places.) and when I put in -2.186 its wrong.