How do you solve (lnx)21=0?

1 Answer
Dec 22, 2015

Rearrange then take exponents to find:

x=e or x=1e

Explanation:

Add 1 to both sides of the equation to get:

(lnx)2=1

Hence:

lnx=±1

By definition of ln we know elnx=x. Hence:

x=elnx=e±1

That is x=e or x=1e