Question: f(x) = -x - 8x - 18 Find all values of x that correspond to horizontal tangent lines. Select None if the function does not

 f(x) = -x² - 8x - 18 Find all values of

x that correspond to horizontal tangent lines. Select "None" if the function

f(x) = -x² - 8x - 18 Find all values of x that correspond to horizontal tangent lines. Select "None" if the function does not have any values of x that correspond to horizontal tangent lines.

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