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Andrewisbadatmath

  • 3 years ago

Consider the functions f(x) = 2(x − 9) and g(x) = 4x. What is the value of (f − g)(5)? 12 28 20 −28

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  1. ZeHanz
    • 3 years ago
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    Just remember: (f-g)(5)=f(5)-g(5)

  2. Andrewisbadatmath
    • 3 years ago
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    So what do i plug in?

  3. ZeHanz
    • 3 years ago
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    Plug in 5 in both of the functions and subtract the outcomes.

  4. Andrewisbadatmath
    • 3 years ago
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    so, f(5) = 2(5-9) and g(5)=4 times 5?

  5. Andrewisbadatmath
    • 3 years ago
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    now i am confused

  6. dpaInc
    • 3 years ago
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    simplify f(5) = ??? g(5) = ???

  7. dpaInc
    • 3 years ago
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    you got it right earlier... just need to simplify....

  8. Andrewisbadatmath
    • 3 years ago
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    ohhh...

  9. ZeHanz
    • 3 years ago
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    @Andrewisbadatmath: right, and if you've found f(5) and g(5), you calculate their difference: f(5) - g(5)

  10. Andrewisbadatmath
    • 3 years ago
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    ok thank you

  11. ZeHanz
    • 3 years ago
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    YW!

  12. Andrewisbadatmath
    • 3 years ago
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    so it is -12?

  13. Andrewisbadatmath
    • 3 years ago
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    no i meant 12

  14. ZeHanz
    • 3 years ago
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    f(5) = 2(5-9) = 2*(-4)=... g(5) = 4*5 = ... f(5) - g(5) = ... (not 12)

  15. ZeHanz
    • 3 years ago
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    You will get -8 - 20 = ...

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