Question

Consider the functions f(x) = 2x + 1 and g(x) = x2 − 10. What is the value of f[g(3)]?

39
−3
−7
−1

Answer 1

First find the value of the function g(3)

Answer 2

3x2−30?

Answer 3

No input 3 instead of x

Answer 4

oh so divide then?

Answer 5

no
g(3)=(3)²-10

Answer 6

but dont you divide (3)^2-10/3 if you want g?

Answer 7

sorry im bad at this

Answer 8

No no it is not 3g it is g(3) which is a different thing. g(3) just means the value when x is 3

Answer 9

ohhhhhhhhhhhhhhhhh

Answer 10

for example if x = 1 then x²-10 = -9 so g(1) = -9

Answer 11

i see

Answer 12

does x = 3 for x too?

Answer 13

@radar @FaiqRaees

Answer 14

does x = 3 for f too?*

Answer 15

no did you find the answer for g(3)

Answer 16

how do i do that?

Answer 17

for g(3) replace 3 in place of x

Answer 18

so thenit would be -3?

Answer 19

no g(x) = x²-10
g(3) = 3²-10
g(3)=9-10

Answer 20

FaiqRaees is doing an excellent job, focus, study the posts.

Answer 21

sorry

Answer 22

ohhhh i mean -1

Answer 23

yep since g(3) = -1 so you can replace that into f(g(3))
f(g(3)) = f(-1)

Answer 24

now find the value of f(-1)

Answer 25

-1?