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

aussy123

Can someone explain this to me? I already know the answer, but I don't understand why its the answer. Without solving the equation, determine the nature of the roots of x2 - 2x - 8 = 0. Two, real unequal roots Two, real equal roots No real roots

  • one year ago
  • one year ago

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

    \[ax^2+bx+c=0\]consider the discriminant \[\Delta=b^2-4ac\]

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

    the discriminant is part of the quadratic formula \[x=\frac{-b\pm\sqrt{\Delta}}{2a}\]

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

    the quadratic formula takes plus and minus the square root of the discriminant, plus and minus a square root will have one value if the term in the square root is 0, two values if the term in the sqrt is positive, and no real values f the term in the square is negative

    • one year ago
  4. UnkleRhaukus
    Best Response
    You've already chosen the best response.
    Medals 1

    *if

    • one year ago
  5. aussy123
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay thanks, this is a mouthful but I understand lol.

    • one year ago
  6. UnkleRhaukus
    Best Response
    You've already chosen the best response.
    Medals 1

    **and no real values if the term in the square root is negative

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

    yeah it is a complicate formula

    • 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.