Question

Can someone check this quiz for me?
1.) If f(x) = 8x and g(x) = 2x + 1, find (fog)(x)

A.) 16x^2 + 8x
B.) 16x + 1
C.) 16x + 8 <-- (my answer)
D.) 10x + 1

2.) If h(x) = (fog)(x) and h(x) = 5(x+1)^3, find f(x) and g(x)

A.) f(x) = x+1; g(x) = 5x^3
B.) f(x) = 5x^3; g(x) = x+1<-- (my answer)
C.) f(x) = (x + 1)^3; g(x) = x + 1
D.) f(x) = 5x^3; g(x) = (x + 1)^3

~Will post the rest in the comments~

Answer 1

1) is right

Answer 2

2) is right also

Answer 3

3.) for f(x) = 4x + 1 and g(x) = x^2 - 5, find (f + g)(x)

A.) x^2 + 4x + 6
B.) 4x^2 - 19
c.) 4x^3 - 4
D.) x^2 + 4x - 4 <-- (my answer)

4.) ~I did something wrong on this one. ;-;~
For f(x) = 2x + 1 and g(x) = x^2 - 7, find (f - g)(x)

A.) x^2 - 2x - 8
B.) 2x^2 - 15
C.) 8 + 2x - 2x
D.) -x^2 + 2x - 6
(I got x^2 + 2x +8)

Answer 4

@mathstudent55
Would yhu mind checking these for me real quick. ;c

Answer 5

@mathmale