Question

e^x=-4

Solve the equation for x. If necessary, round your answer to two decimal places. Do not include "x =" in your answer.

Answer 1

e^x = -4

ln(e^x) = ln(-4)

Since you cannot take the natural log of a negative number, this means that we can stop and simply say that there are no solutions.

Answer 2

I wrote the problem wrong it does have an In<
Its In e^x=-4

Answer 3

ln(e^x) = -4

x*ln(e) = -4

x*1 = -4

x = -4


So the solution is x = -4

Answer 4

the right part not is correct because (-4) using ln can being writing -4lne
that we know that lne =1 so than lne^x =xlne
- and -4lne =xlne so than x=-4

Answer 5

e^x is always >0 so it cannot be equal to -4, No Solution.

Answer 6

how do you think e^(-4) = 1/(e^4) not is always greater than zero ?

Answer 7

@jhonyy9 you need to review exponential functions.
Have you seen the graph of the function e^x. Look at the graph attached and

http://archives.math.utk.edu/visual.calculus/0/exp_log.5/index.html

Answer 8

thank you - yes you are right

good luck

bye