Question

Check my answers please..

Answer 1

1. Find the domain of the function.

f(x)= 21 over x^2 +2x-168

I got (- infinity, -14)u(-14,12)u(12, infinity sign)

Answer 2

2. Same thing.
g(x)= square root x-2 over x-6

I got Domain of g->> [2,6)u(6,infinity sign)

Answer 3

3. For f(x)= 5x-4, g(x)= 2x^2 -5
A. (f0g)(x) B (g0f)(x) C. (f0g)(-1) D. (g0f)(-1)

A. 10x^2 -29
B. 50x^2 -80x+28
C. -39
D. 58

Answer 4

for number 2 - what about values of x going back to -infinity?

Answer 5

4. Given f(x)= x+7, g(x)= 3x^2, f+g, f-g, fg, f/g

1. 3x^2 +x+7
2. -3x^2 -x+7
3. 3x^2 +21x^2
4. x+7 over 3x^2

Domain for f+g, f-g,fg-> (- infinity sign, infinity sign)
Domain for f/g -> (-infinity sign,0)u(0, infinity sign)

Answer 6

What?

Answer 7

for number 2 add the values of x from - infinity

Answer 8

Sorry but I don't understand what your saying.

Answer 9

x>/ 2 and x=6
[2,infinity)
(- infinity, 6)u(6,infinity)

Answer 10

do you think its the last of these?

Answer 11

Last of what? O.o