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

dddan Group Title

please help!! how do u solve for b^3+20b=9b^2?

  • one year ago
  • one year ago

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

    rewrite the equation so that you have \[b^3 - 9b^2 + 20b = 0\] now take b as a common factor \[b(b^2 - 9b + 20) = 0\] factor the quadratic in the brackets... you need the factors of 20 than add to -9.... they are both negatives... then you should be able to find the solutions.

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

    so is it 5 and 4?

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

    well you'll have \[b(b -5)(b-4) = 0\] so the solutions are b = 0, 4, 5

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

    thank you

    • 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.