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

bless Group Title

Which is equal to 3[f(2x)] for f(x) = 3x^2+3/2? a.15/2 b. 81/2 c. 9x^2+9/2 d.18x^2+9

  • one year ago
  • one year ago

  • This Question is Closed
  1. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    What part of this is giving you trouble?

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

    when i try to substitute the f(x) to the 3[f(2x)] i can't get the answer

    • one year ago
  3. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    You substitute 2x into f(x), then multiply through the whole thing by 3.

    • one year ago
  4. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Hmmm... and yes, if that is written right, I can see why that would not get an answer.

    • one year ago
  5. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Is it supposed to be \(3[f(2)]\)?? Rather than 2x?

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

    the answer is 108x^2 + 9/2?

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

    its 2x

    • one year ago
  8. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes, as written, \(108x^2 + \cfrac{9}{2}\) would be correct.

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

    if u want this answer then u should in question (3x)^2 instead of 3(x^2)

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

    well there was another option to solve this problem : if the correct answer is not in the given choices, write you answer

    • one year ago
  11. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Ah, yes... I see what Muhammad_Nauman_Umair is pointing out.

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

    thanks for your help guys @Muhammad_Nauman_Umair and @e.mccormick

    • one year ago
  13. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    \((2x)^2=4x^2\) \(3\times 4x^2=12x^2\) \(3\times 12x^2=36x^2\) Which is what I got the first time... and when you said 108 I thought I had forgotten to multiply by 3.

    • one year ago
  14. e.mccormick Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    \(36x^2 + \cfrac{9}{2}\) is what it should be.

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

    36x^2+9/2

    • 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.