Question

Functions HELP!!!

Answer 1

Given the following functions f(x) and g(x), solve (f + g)(3) and select the correct answer below:

f(x) = 2x + 21

g(x) = x − 24

A.) −27
B.) −21
C.) 6
D.) 48

Answer 2

@dan815 @Data_LG2 @phi @Mchilds15 @LynFran

Answer 3

(f + g)(3) is short for f(3) + g(3)

can you find f(3) ?

Answer 4

f(x) = 27

Answer 5

you mean f(3)= 27 (f(x) would be the formula 2x+21)

Answer 6

now find g(3)

Answer 7

Yes and g(3) = -21

Answer 8

now add

Answer 9

C.) 6

Answer 10

I need help with some more, if you don't mind.

Answer 11

Given the functions f(x) = 10x + 25 and g(x) = x + 8, which of the following functions represents f[g(x)] correctly?
f[g(x)] = 10x + 33
f[g(x)] = 10x2 + 33
f[g(x)] = 10x + 105
f[g(x)] = 10x2 + 105

Answer 12

yes

the other way to do this is first add f(x)+g(x)
like this:
2x + 21 + x-24
and we get
(f+g)(x)= 3x - 3

now figure out (f+g)(3) = 3*3-3 = 9 - 3 = 6

Answer 13

starting with
f(x) = 10x + 25

we can say
f(a) = 10a+25
f(b*b)= 10*b*b+25
f(xyz)= 10*xyz+25

following that pattern, what is
f( g(x) ) ?