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anonymous

  • one year ago

Given that f(x) = 2x + 1 and g(x) = −5x + 2, solve for f(g(x)) when x = 3....PLEASE HELP

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  1. welshfella
    • one year ago
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    first, replace the x in g(x)by 3 and work it out:- g(3) = -5(3) + 2 then plug this result into f(x) , 2x + 1

  2. welshfella
    • one year ago
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    -5(3) + 2 = -15 + 2 = ?

  3. anonymous
    • one year ago
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    -13

  4. anonymous
    • one year ago
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    so its -25?

  5. welshfella
    • one year ago
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    correct now plug this into 2x + 1 and work it out that's your answer

  6. welshfella
    • one year ago
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    yes

  7. anonymous
    • one year ago
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    got it thanks!

  8. welshfella
    • one year ago
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    yw

  9. Hero
    • one year ago
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    @welshfella what is f(g(x))?

  10. welshfella
    • one year ago
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    f(g(x)) = 2(-5x + 2) + 1

  11. Hero
    • one year ago
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    Yes you should explain to the user how to calculate f(g(x)) first before evaluating f(g(3)). The user may need to know how to do that, especially if asked to graph f(g(x)) for example.

  12. Hero
    • one year ago
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    @welshfella

  13. welshfella
    • one year ago
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    yes - point taken

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