Question

How do you solve `45 = e^x`?

Answer 1

`x=ln(45)`

Explanation:

By definition:
`color(white)("XXX")ln a = c hArr e^c = a`
(memorize this)

So
`color(white)("XXX")e^x=45 hArr ln 45`

Using a calculator `ln 45 ~= 3.81`