Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Rajah

  • 3 years ago

√(x+4)+√(2x+6)=7

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

    rsmith almost gets the question right. (a+b)^2 = a^2 + 2ab + b^2,

  2. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    this is how I'd approach it: \[ \sqrt{x+4} = 7 - \sqrt{2x+6} \] \[ x+ 4 = 49 + (2x+6)-14 \sqrt{2x+6} \] \[ x + 4 -49 -2x-6=-14\sqrt{2x+6} \] \[ -x -51 = -14\sqrt{2x+6} \] \[ x+51 = 14\sqrt{2x+6} \] I am sure you can continue and solve this equation now.

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

    @ rsmith, you can validate whether your answer is correct by plugging x=13 into the equation sqrt(13+4) + sqrt(2*13+6) =7 sqrt(17) + sqrt(32) = 7 ?

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

    dont u got to do the one and the ( and here first then u have to to keep bringing it down

  5. alice_smith
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    till u get ur answer or change keep oppisite

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

    @oojih where are you going with your solution?

  7. alice_smith
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i think am right yay

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

    Just square both sides: 3x+10+ 2 sqrt(......=49) etc etc.

  9. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @ rsmith, you need to square the equation one more time to get rid of the square toot, then it boils down to a quadratic equation whic looks prett nasty from the number.

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

    u have to add

  11. alice_smith
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    u confuse me

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

    yes x^2 + 102x + 2601 = 196(2x+6) does look nasty

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

    am correct

  14. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[ x+ 51 = 14 \sqrt{2x+6} \] \[ (x+51)^2 = 14^2 (2x+6) \] yes..mr rajah can solve this fun quadratic equation

  15. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    check out http://www.oojih.com/displaypage/algebra/ for more algebra study guide and practice test.

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

    x^2 - 290x +1425 = 0

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

    you are right oojih. :) roots are 285 and 5. 285 is not sensible so the root being 5 works

  18. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sqrt(5+4) + sqrt(2*5+6) =7 sqrt(9) + sqrt(16) = 3 + 4 = 7... yaayy, good job rsmith

  19. oojih.com
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I command you for solving the quadratic equation..:) This is a good math question, but the number should be made simpler so that students get the concept instead of being bogged down by this ugly number.

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

    true that

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

    Search OpenStudy
    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.