Algebra..
posted by victoria .
Check These Answers Please?
f(x)= x^2+3 ; g(x)=3x1
1. (f+g)
=x^2+3x+2
2. (f+g)(3)
= 20
3. (fg)(x)
= x^2+3x4
4.(fg)(x)
= 3x^3+1x^29x+3
5. (fg)(x)
=5
6. (f/g)(x)
=(x^2+3)/(3x1)
Compostitions of functions :
7. (f o g)(x)
=3x^2+4
8. (f o g)(x)
=10

1. ok
2. ok
3. (fg)(x) = x^2  3x + 4
4. (fg)(x) = 3x^3  x^2 + 9x  3
5. (fg)(x) is not a number. Also, I find no value for x where (fg)(x) = 5
6. ok
7. (fog)(x) = f(g(x))
= g^2 + 3
= (3x1)^2 + 3
= 9x^2  6x + 4
8. same as 5.