Question

For the graph of f(x)=3-2x^2, why is the domain "all real numbers" and not something involving infinity, like (-infinity, infinity)?

Answer 1

they are conventionally equivalent ways of stating the same thing.

For myself, I prefer the first one.

Answer 2

oh, so they are just different ways of stating the same thing?

Answer 3

Conventionally, yes.

Answer 4

awesome, that makes sense now! Thank you! :D

Answer 5

ur welcome.