A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

how do is solve this 13x^2-38x-3

  • This Question is Closed
  1. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Do you mean how to factor it?

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

    yes

  3. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    (13x+1)(x-3)

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how

  5. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Do you know that trinomials come from multiplying two binomials?

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  7. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So we know it would be ( )( )

  8. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes i get that

  9. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    We also know that one sign would have to be positive and one negative since the last term is negative. Still with me?

  10. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes agree

  11. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Now how could we possibly get 13x^2 ?

  12. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what do u mean?

  13. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you can do this by grouping with the ac method: ax^2+bx+c a=13 c=-3 ac=-39x^2 Find two factors of -39 that add up to -38 The factors are -39x and +1x To group, rewrite the equation 13x^2-39x+1x-3 remove like variables 13x(x-3)+1(x-3) remove (x-3) as a factor and combine 13x+1: (x-3)(13x+1)

  14. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The first term of the trinomial we are trying to factor is 13x^2. So we have to multiply 2 factors that will give us 13x^2 . What might they be?

  15. Mertsj
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh. I see that rickjbr wants to help you now so I'll turn you over to him.

  16. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1*13

  17. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry mertsj

  18. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    didn't mean to jump in

  19. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so who's going to help me?

  20. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i'll help

  21. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok so i don't understand why it is (x-3)(13x+1)

  22. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if you expand those two binomials, youll get back to your original trinomial using the FOIL method

  23. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    13x^2+1x-39x-3= 13x^2-38x-3

  24. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh i got it i was just confusing myself

  25. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you!!!

  26. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sure no problem

  27. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.