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​Find (f+g)(x) for the following two functions:

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Find (f+g)(x) for the following two functions:

f(x)=2x+1

g(x)=5x-3

(a) (f+g)(x)=  x             

 (b) (f+g)(x)= 3x-2

 

(c) (f+g)(x)= 7x-2          

(d) (f+g)(x)= 8x-3
Feb 8th, 2015

(f+g)(x) = f(x) + g(x)

(f+g)(x) = 2x + 1 + 5x - 3

(f+g)(x) = 7x - 2


A.

(f+g)(x) = x

7x-2 = x

6x = 2

x = 1/3


B.

(f+g)(x)= 3x-2

7x-2 = 3x-2

4x = 0

x = 0


C.

(f+g)(x)= 7x-2     

7x-2 = 7x-2

0 = 0


D.

(f+g)(x)= 8x-3

7x-2 = 8x-3

1 = x

x = 1

Feb 8th, 2015

hello, are you saying the answer is 

(f+g)(x) = f(x) + g(x)

(f+g)(x) = 2x + 1 + 5x - 3

(f+g)(x) = 7x - 2



and if so than what are the letter a b c and d for ?? or are those part of the answer as well?

Feb 8th, 2015

oh i mean the answer is C

Feb 8th, 2015

i think we need to simplify..

if this option question the answer is c

Feb 8th, 2015

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