Solve e^x-6e^-x=1

Multiply everything through by ex   and rearrange so it equals zero
you now have e2x -ex-6=0
It is now similar to a quadratic equation, make the dummy substitution y=ex
y=3 or -2 
x= ln(3) and ln(-2) does not exist 

KI
Answered by Kishwar I. Maths tutor

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