Question

If e^-x=4 , then find the value of x

Answer 1

answer is b option.
Taking natural log on both sides we get-
$log_{e}(e ^{ - x} ) = log_{e}(4)$
it simplifies to-
$- x log_{e}(e) = log_{e}(4)$
therefore,
$x = - log_{e}(4)$