Question

List the potential solutions to 2 ln x = 4 ln 2 from least to greatest.

x =
and x =

Answer 1

If you square both sides when rewriting, you get x^2 = 16 so the two potential solutions (least to greatest) are
x = -4 and x = 4.
However, ln x is only defined for x > 0, so the only valid solution is x = 4.