Answer the questions about the following functions, f and g, whose graphs are attached. Answer the questions clearly and using complete sentences, and be sure to explain why and demonstrate understanding of the key ideas we covered in class. 1. What is the domain of f? 2. What is the range of f? 3. Where is f increasing? Where is it decreasing? 4. Where is f zero? 5. What is the value of f at zero? 6. What is the domain of g? 7. What is the range of g? 8. Where is g increasing? Where is it decreasing? 9. What is the domain for any combination of f and g? 10. What additional domain restrictions would you have to add for f/g or g/f? 11. Where is fg = 0? 12. Where is fg > 0? 13. Where is fg increasing? 14. What is the range of f + g? 15. What is the range of f – g? 16. What’s the domain of the composition, f(g(x))? 17. What’s the range of the composition, f(g(x))? 18. What is the domain of the composition g(f(x))? 19. What is the range of the composition g(f(x))? 20. Where is f(g(x))=0? 21‐40, repeat each of the above questions for the functions r and s attached.
42. Compare and contrast the domains of the compositions for f(g(x)) and r(s(x)). 43. Write two pairs of functions, one pair that, when composed, the domain of the composition is the same as the domain of the inner function, and one where the domain of the composition is different than the domain of the inner function. f (x ) = x - 1 - 2 g( x ) =
6
x + 7- 4
4
2
-10
-5
f
5
10
-2 g
-4
-6
8
1
6
s ( x ) = ( x - 1) 3 r (x ) =
( ) 1 4
!x - 2 4
2 s
-10
-5
5
10
r -2
-4