Question

e^-x=6

Answer 1

X=-ln6

Answer 2

in equivelant logarithic form this says
\[ln(6)=-x\]so
\[x=-ln(x)\]

Answer 3

what eliza said, not what i said

Answer 4

\[x=-ln(6)\] is right

Answer 5

Remember that \[e^k = a \iff ln\ a = k\]

So in your case you have k = -x and a = 6. Therefore:

\[e^{-x} = 6 \iff ln(6) = -x\]\[\therefore x = -ln(6)\]