solve for x in this equation:e^x + e^-x=5

Question

i really don't have an idea how to solve this

Answer 1

$a^2+\frac{1}{a}=5$

$a^2-5a+1=0$

$a=4,...$ you can use ABC formula
any 2 solusion, $x=ln 4,...$ and $x=-ln4,...$

Comments

honestly,i don't understand the solution.sorry.,,is there another method to solve this??ahm.,a simplier one??tnx