Question

What is the true solution to In 20+In 5=2 In x?

Answer 1

"true solution?"

ln 20 + ln 5 = 2 ln x can be re-written as

ln (20)(5) = ln x^2. We can drop the "ln" operator:

100=x^2 which yields x=10 and x=-10. The negative result must be discarded, since 2 ln (-10) is undefined.

x=10 (answer)