math

Given f(x)=7-2x find f (x+5) 
I'm not sure how to approach this problem. 
I have done this so far: 
F(x+5) = 7-2x 
F(x+5)=7-2(x+5) 
F(x+5)=7-(2x+10) 
Not sure if this is right and what to do next.

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  1. f(x)=7-2x

    In f(x+5) you have replaced the x with x+5, so do the same thing on the right side

    f(x+5) = 7 - 2(x+5)
    = 7 - 2x - 10
    = -3 - 2x <-----> same as 7-(2x+10) , you had it

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  2. Oh. Thank you so much! I am glad that you helped.

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