To solve for \( 8x \) given the equation \( 2x = -4 \), first, we need to find the value of \( x \).
- Divide both sides of the equation \( 2x = -4 \) by 2:
\[ x = \frac{-4}{2} = -2 \]
- Now, substitute \( x = -2 \) into \( 8x \):
\[ 8x = 8(-2) = -16 \]
Therefore, the value of \( 8x \) is \( -16 \).