Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

PhiBeeandJay Group Title

Please help! Find f(-x)-f(x) for the following function: f(x)=x^3+x-9

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What is f(-x)?

    • 2 years ago
  2. PhiBeeandJay Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    The question didn't say and so I'm stuck.

    • 2 years ago
  3. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \(f(3)=3^2+3-9=27+3-9=21\) \(f(-3)=(-3)^2+(-3)-9=-27-3-9=-39\) \(-39-21=-60\) now try it with just \(x\) and \(-x\)

    • 2 years ago
  4. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \(f(-x)\) is confusing, but it means replace \(x\) everywhere by \(-x\)

    • 2 years ago
  5. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so first step is to write \(f(-x)= (-x)^3+(-x)-9\) and then simplify a big take that answer, and subtract \(x^3+x-9\) from it make sure to use parentheses

    • 2 years ago
  6. PhiBeeandJay Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    So it would be -x-x-9-(x^2+x-9)?

    • 2 years ago
  7. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i assume you mean \[-x^3-x-9-(x^3+x-9)\]

    • 2 years ago
  8. PhiBeeandJay Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes.

    • 2 years ago
  9. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok good, now remove the parentheses by distributing the minus sign, then combine like terms

    • 2 years ago
  10. PhiBeeandJay Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you!

    • 2 years ago
  11. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yw hope it is clear

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.