anonymous
  • anonymous
Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of (f + g)(3)? −4 4 −32 8
Mathematics
chestercat
  • chestercat
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amorfide
  • amorfide
f(3) + g(3) substitute x=3 into the function f then substitute 3 into the function g then add the answers together
hartnn
  • hartnn
what di u get?
anonymous
  • anonymous
idk i dont understand how to do these

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hartnn
  • hartnn
u know how to find f(3) ?
anonymous
  • anonymous
nope
anonymous
  • anonymous
its been a while since i did these and i forgot
amorfide
  • amorfide
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
  • hartnn
to get f(3) put x=3 in f(x)
amorfide
  • amorfide
so for your function f(x) = x2 − 13 you want to replace all x with 3 so you get f(3)=3²-13 then do the same with g then add your answers
anonymous
  • anonymous
f(2) = (2)2 - 13 and g(2) = 2 + 5?
anonymous
  • anonymous
i mean three lol
anonymous
  • anonymous
f(3) = (3)2 - 13 and g(3) = 3 + 5?
amorfide
  • amorfide
yes that is right
amorfide
  • amorfide
now get an answer for each function add your answers together
anonymous
  • anonymous
f(3) = 9 - 13 = f(3) = -4
anonymous
  • anonymous
g(3) = 3 + 5 = g(3) = 8
anonymous
  • anonymous
now what do i do???
amorfide
  • amorfide
f+g -4+8
anonymous
  • anonymous
wait when i do f+g what do i do with the 3's??
anonymous
  • anonymous
-4+8=4
anonymous
  • anonymous
so the answer is 4??

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