Question

(x-3)e^x=0 ? How to figure this out?

Answer 1

by the zero factor property either e^x=0 or x-3=0
when is e^x=0 ?

Answer 2

or @ -infi :P

Answer 3

...and as we just established x=-infinity is not an actual possible value of x, so for all intents and purposes, when is e^x=0
(let the asker answer please)