Question

log2 8^x=-3

Answer 1

i got no solution?

Answer 2

\[\log_{2}8^x=3 \]
\[2^3=8^x\]
\[2^3=(2^3)^x\]
\[2^3=2^{3x}\]
\[3=3x\]
1=x

Answer 3

Oh. I missed the negative sign.
Let me correct.

Answer 4

\[2^{-3}=2^{3x}\]
-1=x