Question
Evaluate $-b^{2}-2 b x^{2}-x$ when $x=-2$.

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Answer

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Answer

So, the simplified equation after substituting $x=-2$ is $\boxed{-b^{2}-8b+2}$

Steps

Step 1 ：Substitute $x=-2$ into the equation $-b^{2}-2 b x^{2}-x$

Step 2 ：The equation becomes $-b^{2}-2 b (-2)^{2}-(-2)$

Step 3 ：Simplify the equation to get $-b^{2}-8b+2$

Step 4 ：So, the simplified equation after substituting $x=-2$ is $\boxed{-b^{2}-8b+2}$