Question

Consider the functions f(x) = 3x − 2 and g(x) = x2 − 1. What is the value of f[g(5)]?

312
70
168
−1

Answer 1

first find g(5) by replacing the x in x^2 - 1 and working it out

Answer 2

can you do that?

Answer 3

g(5)= 5^2-1 ?

Answer 4

is that what you mean?

Answer 5

yes

Answer 6

g(5) means the value of g when x = 5

Answer 7

g(5) =24

Answer 8

g(5) = 25 - 1 = 24

f(g(5)) = f(24) ( replacing g(5) by 24)

can you work this out?

Answer 9

again just relpace the x in f(x) (3x - 2) by 24 and simplify

Answer 10

hey its value is 70

Answer 11

f(x)=(3(24) -2) @welshfella

Answer 12

and are you sure @madhu.mukherjee.946

Answer 13

yeah

Answer 14

could you at least show your work

Answer 15

ok

Answer 16

see g(x)=x^2-1 so g(5)=25-1=24
now,f[g(5)]=3x-2=3*24-2
=72-2=70

Answer 17

yes thats correct

Answer 18

you multiply the 3 by 24 first then subtract the 2

Answer 19

ok thank you guys xoxo so the answer is 70 @madhu.mukherjee.946 @welshfella

Answer 20

yw