Solmyr
Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of (f + g)(3)?
−4
4
−32
8



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amorfide
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f(3) + g(3)
substitute x=3 into the function f
then substitute 3 into the function g
then add the answers together

hartnn
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what di u get?

Solmyr
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idk i dont understand how to do these

hartnn
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u know how to find f(3) ?

Solmyr
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nope

Solmyr
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its been a while since i did these and i forgot

amorfide
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f(x) is a function containing x
if you want f(3) you want a function containing 3's so wherever x was originally you would replace them all with 3

hartnn
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to get f(3) put x=3 in f(x)

amorfide
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so for your function
f(x) = x2 − 13
you want to replace all x with 3
so you get
f(3)=3²13
then do the same with g
then add your answers

Solmyr
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f(2) = (2)2  13 and g(2) = 2 + 5?

Solmyr
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i mean three lol

Solmyr
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f(3) = (3)2  13 and g(3) = 3 + 5?

amorfide
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yes that is right

amorfide
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now get an answer for each function
add your answers together

Solmyr
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f(3) = 9  13 = f(3) = 4

Solmyr
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g(3) = 3 + 5 = g(3) = 8

Solmyr
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now what do i do???

amorfide
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f+g
4+8

Solmyr
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wait when i do f+g what do i do with the 3's??

Solmyr
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4+8=4

Solmyr
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so the answer is 4??