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help_people

  • one year ago

Consider the functions f(x) = 3x − 2 and g(x) = x2 − 1. What is the value of f[g(5)]? 312 70 168 −1

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  1. welshfella
    • one year ago
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    first find g(5) by replacing the x in x^2 - 1 and working it out

  2. welshfella
    • one year ago
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    can you do that?

  3. help_people
    • one year ago
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    g(5)= 5^2-1 ?

  4. help_people
    • one year ago
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    is that what you mean?

  5. welshfella
    • one year ago
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    yes

  6. welshfella
    • one year ago
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    g(5) means the value of g when x = 5

  7. help_people
    • one year ago
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    g(5) =24

  8. welshfella
    • one year ago
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    g(5) = 25 - 1 = 24 f(g(5)) = f(24) ( replacing g(5) by 24) can you work this out?

  9. welshfella
    • one year ago
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    again just relpace the x in f(x) (3x - 2) by 24 and simplify

  10. madhu.mukherjee.946
    • one year ago
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    hey its value is 70

  11. help_people
    • one year ago
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    f(x)=(3(24) -2) @welshfella

  12. help_people
    • one year ago
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    and are you sure @madhu.mukherjee.946

  13. madhu.mukherjee.946
    • one year ago
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    yeah

  14. help_people
    • one year ago
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    could you at least show your work

  15. madhu.mukherjee.946
    • one year ago
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    ok

  16. madhu.mukherjee.946
    • one year ago
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    see g(x)=x^2-1 so g(5)=25-1=24 now,f[g(5)]=3x-2=3*24-2 =72-2=70

  17. welshfella
    • one year ago
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    yes thats correct

  18. welshfella
    • one year ago
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    you multiply the 3 by 24 first then subtract the 2

  19. help_people
    • one year ago
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    ok thank you guys xoxo so the answer is 70 @madhu.mukherjee.946 @welshfella

  20. welshfella
    • one year ago
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    yw

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