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

brandonloves Group Title

find indicated sum, difference, product or quotient: f(x)=16-x^2; g(x)=4-x find (f+g)(x)

  • one year ago
  • one year ago

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

    g(f(x)) = 4-(16-x^2) right so far?

    • one year ago
  2. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes.

    • one year ago
  3. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so then it's 4 -16 +x^2

    • one year ago
  4. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    and -12 +x^2

    • one year ago
  5. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yup! :)

    • one year ago
  6. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    cool, now do I plug in that g(x) for f(x)= 16-x^2

    • one year ago
  7. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    quite horrible, but just sub 4-x into the x.

    • one year ago
  8. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    like 16 -(4-x)

    • one year ago
  9. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \(16 -(4-x)^2\)

    • one year ago
  10. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh shoot, I forgot the exponent

    • one year ago
  11. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    16-(4-x)^2 is 16 (-4-x)(-4-x) which is 32 +8x+x^2

    • one year ago
  12. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    and then add that to the -12+x^2 from g(x)?

    • one year ago
  13. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm, very close, but something's off isn't it?

    • one year ago
  14. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    16-(4-x)^2 is not 16 (-4-x)(-4-x) it's 16 - (4-x)(4-x) though.

    • one year ago
  15. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhh, that may fix it

    • one year ago
  16. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah. something will cancel out.

    • one year ago
  17. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yea, it left +8x -x^2

    • one year ago
  18. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    but I still don't have it exactly right. I should be getting -x^2 +x +12 I think, but I've got a -12

    • one year ago
  19. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    note that (f+g)(x)=16-x^2 +4-x

    • one year ago
  20. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    (f-g)(x)=16-x^2 -(4-x)

    • one year ago
  21. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm, so what do I need to do to solve it now?

    • one year ago
  22. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    well, first, lol which are you doing? addition or subtraction?

    • one year ago
  23. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    well, it says f+g, so I would assume addition

    • one year ago
  24. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so, simplify this one and you're done. (f+g)(x)=16-x^2 +4-x

    • one year ago
  25. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok

    • one year ago
  26. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    16-(12+x^2) +4-(12+x^2)? I think I screwed it up

    • one year ago
  27. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    or is it 16-(+8x -x^2) +4-(+8x -x^2) I'm not too sure of anything anymore

    • one year ago
  28. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you don't need sub anything, just simplify as it's (f+g)(x) =f(x)+g(x)

    • one year ago
  29. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh, cuz I've already done all that. duh.

    • one year ago
  30. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    but when I add them together, I only get 20, the x^2's cancel out

    • one year ago
  31. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I have an option for the answer to be -x^2-x+20

    • one year ago
  32. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    add 16-x^2 and 4-x only.

    • one year ago
  33. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok, well, thats it, obviously. but what happened to the 8x and +/-2x^2's? were those just wrong?

    • one year ago
  34. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    they weren't needed? :)

    • one year ago
  35. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    jesus christ. haha. well ok. sorry for being such a pain in the retrice thanks for the help though

    • one year ago
  36. brandonloves Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm, well thats an odd substitution for @$$.... whatever lol

    • one year ago
  37. Shadowys Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    lol you're welcome

    • one year 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.