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anonymous

  • one year ago

Given the following functions f(x) and g(x), solve f[g(7)] and select the correct answer below: f(x) = 4x + 21 g(x) = 2x + 2 16 49 85 784

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  1. cwrw238
    • one year ago
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    g(7) = 2(7) + 2 = 16

  2. cwrw238
    • one year ago
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    oops - my bad thinking now you need to plug x = 16 into f(x)

  3. cwrw238
    • one year ago
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    4(16) + 21 = ?

  4. cwrw238
    • one year ago
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    - this gives you the value of f[g(7)]

  5. anonymous
    • one year ago
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    85

  6. anonymous
    • one year ago
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    so C

  7. cwrw238
    • one year ago
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    yes

  8. anonymous
    • one year ago
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    can you help with another ?

  9. cwrw238
    • one year ago
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    one more

  10. anonymous
    • one year ago
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    Given the functions f(x) = 7x + 13 and g(x) = x + 2, which of the following functions represents f[g(x)] correctly? f[g(x)] = 7x + 15 f[g(x)] = 7x + 27 f[g(x)] = 7x2 + 15 f[g(x)] = 7x2 + 27

  11. cwrw238
    • one year ago
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    you need to replace the x in f(x) - that is 7x + 13 - by g(x) which is x + 2 then simplify so we get 7(x + 2) + 13 - can you simplify this further?

  12. anonymous
    • one year ago
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    yes but how ?

  13. cwrw238
    • one year ago
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    7(x + 2) + 13 = 7*x + 7*2 + 13 = ?

  14. cwrw238
    • one year ago
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    you distribute the 7 over the x + 2

  15. cwrw238
    • one year ago
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    - that was the first step

  16. cwrw238
    • one year ago
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    so now its just simplifying 7x + 7*2 + 13

  17. anonymous
    • one year ago
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    is it A ?

  18. cwrw238
    • one year ago
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    no what is 7*2 ?

  19. cwrw238
    • one year ago
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    7 times 2

  20. cwrw238
    • one year ago
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    surely you know what 7 times 2 is?

  21. cwrw238
    • one year ago
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    right so we have 7x + 14 + 13 - now is just one add and you have the answer

  22. cwrw238
    • one year ago
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    add the 2 numbers

  23. cwrw238
    • one year ago
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    correct 7x + 27

  24. anonymous
    • one year ago
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    thanks

  25. cwrw238
    • one year ago
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    yw

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