Question

Pre calc help!

Answer 1

hit me

Answer 2

Domain of f
3x(power of 2) +1
(I hate my tablet :/)

Answer 3

idk jk

Answer 4

you mean you want the domain of
\(f(x) = 3x^2 + 1\)
??

well, what values does x cannot take?

Answer 5

Yep
Wdym?

Answer 6

ok,

if we have a \(\sqrt..\), then the function inside that square root must be positive.
the values of x that make the \(\sqrt. \) negative are not in the domain.

similarly,
the denominator of a function cannot be = 0.
the values of x for which the denominator = 0 are not in the domain.

so for 3x^2+ 1
what are the values of x which are not in the domain of x?

Answer 7

Wait, to find a domain, you would need to havea graph right?

Answer 8

you can, thats one way.
what we are doing is trying to find it algebraiclally.

Answer 9

Well then i have no clue cause i only learned by graph.

Answer 10

so if you plot 3x^2 +1,
what do you observe ?

Answer 11

is there any value that x cannot take?

Answer 12

Um, give me a min

Answer 13

It can take any value...

Answer 14

right!

so the domain is all real numbers :)

Answer 15

Oh ok. Thanks! :D

Answer 16

welcome ^_^