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

math0101 Group Title

√(2x-1)=-3 Help?

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    by squaring both sides\[2x-1=9\]

    • 2 years ago
  2. pratu043 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\sqrt{2x - 1} = -3\] Square on both sides. \[2x - 1 = 9\] Quite simple now, can you do it?

    • 2 years ago
  3. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    solve for 'x' from here

    • 2 years ago
  4. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    don't even start this problem \(\sqrt{2x-1}\) is positive, whereas \(-3\) is negative, so there is no solution

    • 2 years ago
  5. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    don't square both sides, don't do anything at all a positive number cannot equal a negative one say "no solution" and be done

    • 2 years ago
  6. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    which is good example of making sure you think before you apply some method to a problem

    • 2 years ago
  7. math0101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hmm... the sqrt(9) isn't -3, but I don't see how that disallows -3^2

    • 2 years ago
  8. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    i am assuming you are looking for a real value for \(x\) and not two complex numbers whose square is \(-3\)

    • 2 years ago
  9. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    but @satellite73 sir this gives the condition of the question but he needs to solve for 'x'

    • 2 years ago
  10. pratu043 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I didn't think from that point of view.

    • 2 years ago
  11. pratu043 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    That was a good point.

    • 2 years ago
  12. math0101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Allright, I think I'm getting it. Thanks for all the help. :)

    • 2 years ago
  13. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    if so (and i really really doubt it) then this method \[2x-1=9\] \[2x=10\] \[x=5\] will certainly not work, and the check is easy \[\sqrt{2\times 5-1}=\sqrt{9}=3\neq -3\]

    • 2 years ago
  14. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    hmmmm......

    • 2 years ago
  15. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    u r right sir :) sorry!

    • 2 years ago
  16. math0101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Excellent answer, satellite73!

    • 2 years ago
  17. jiteshmeghwal9 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    @math0101 for steps u can first solve it & prove this wrong or other answer is as @satellite73 sir's answer :)

    • 2 years 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.