Question

e^x-12e^(-x)-1=0

Answer 1

Multiply through by e^x and you have a quadratic equation in e^x

I.e. If u = e^x, we have

u^2 - 12 - u = 0

Now solve for u, then for x.

Answer 2

x=ln4 but x can not be ln(-3).

Answer 3

Hence there is only one solution

Answer 4

Thanks JamesJ
You are the best!!