Question

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

−4

4

−32

8

Answer 1

f(3) + g(3)
substitute x=3 into the function f
then substitute 3 into the function g

then add the answers together

Answer 2

what di u get?

Answer 3

idk i dont understand how to do these

Answer 4

u know how to find f(3) ?

Answer 5

nope

Answer 6

its been a while since i did these and i forgot

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

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

Answer 11

i mean three lol

Answer 12

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

Answer 13

yes that is right

Answer 14

now get an answer for each function
add your answers together

Answer 15

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

Answer 16

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

Answer 17

now what do i do???

Answer 18

f+g
-4+8

Answer 19

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

Answer 20

-4+8=4

Answer 21

so the answer is 4??