Question

Let f(x) = 3x + 2 and g(x) =7x + 6. Find f ·g and its domain.

A.
21x2 +32x + 12; all real numbers except x = -6/7

B.
21x2 + 32x + 12; all real numbers

C.
6x2 + 4x + 42; all real numbers

D.
6x2 + 4x + 42; all real numbers except x = -2/3

Answer 1

f · g means (3x + 2 ) · (7x + 6)

Answer 2

So, f(g(x)) or in other words (fog) equals ?

Answer 3

Also you can eliminate some of the choices already because there is no denominator or square (or any other even) root in which you say for example √2-x

you know what I mean right ? There is no reason for domain restrictions.

Answer 4

thanks

Answer 5

Ok, can you tell me what you got, to make sure you are correct ?

Answer 6

B :s

Answer 7

@SolomonZelman

Answer 8

Yes, B is the correct answer. (Sorry for the late reply, due to connection problems)

Answer 9

oh haha its ok thank you! :)

Answer 10

Congrats with new color :) And You welcome!

Answer 11

hehe ty :) can you check this one for me. I got A

Let f(x) = 3x + 2 and g(x) =x - 3. Find f(x) - g(x).

A. 2x - 1
B. 2x - 5
C. 2x + 5
D. 4x - 1

Answer 12

@SolomonZelman

Answer 13

Correct , it is A!

Answer 14

yay! thannks :D

Answer 15

Anytime !