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firebird

  • 2 years ago

If f(x) = xsquared does f(a+1) = (a+1)squared

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  1. ASAAD123
    • 2 years ago
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    what's the question?

  2. firebird
    • 2 years ago
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    if f(x) = X squared does it follow that f(a+1) = (a+1) squared

  3. mark_o.
    • 2 years ago
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    True :D

  4. ASAAD123
    • 2 years ago
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    yes

  5. firebird
    • 2 years ago
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    explain why

  6. ASAAD123
    • 2 years ago
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    replace x with (a+1).

  7. firebird
    • 2 years ago
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    How do you evaluate the expresssion f(g(4)) when f(x)= 3x and g(x)= x-2

  8. ASAAD123
    • 2 years ago
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    f(g(4))=3(4-2)=6

  9. hba
    • 2 years ago
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    @firebird Do you understand ?

  10. firebird
    • 2 years ago
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    no

  11. hba
    • 2 years ago
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    So let me explain that to you We have to find f(g(4) So we have to find g(4) first g(x)=x-2 then g(4)=

  12. Shadowys
    • 2 years ago
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    note: if f(x)=3x, g(x)=x-2, then f(g(x))=3(g(x))=3(x-2)

  13. ASAAD123
    • 2 years ago
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    f(g(x)) :substitute g(x) in x of f(x).

  14. Shadowys
    • 2 years ago
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    simply sub anything inside x as long it's in the domain.

  15. hba
    • 2 years ago
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    @firebird Do you follow me ?

  16. firebird
    • 2 years ago
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    yes

  17. hba
    • 2 years ago
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    So what did you get ? g(4)=

  18. firebird
    • 2 years ago
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    4-2=g(x)

  19. firebird
    • 2 years ago
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    So under the same values of f(x) and g(x), g(f(4)) is equal to g(3(x)) which is equal to x-2(3x)?

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