Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

dan18

  • 2 years ago

what is C so that y=2x+3 is tangent to the curve y+x^2 +C?

  • This Question is Closed
  1. RadEn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i think that's y=x^2 +C, right ?

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

    if yes, first take y1=y2, we get a quadratic equation and then to find value of c, take D=0 (D=discriminant) solve for c?

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

    yes, thats what I was thinking, do they mean y=x^2 +C

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

    did u get it?

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

    y=2x+3...........i y=x^2+C........ii

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

    Now, substitute eqn i in eqn ii and tell me what u get

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

    If you want to see the calculation look at the attached file.

    1 Attachment
  8. dan18
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you very much guys for the help! can I ask why is the D=0 (D=discriminant)?

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

    descriminant is 0 because it is a tangent to the curve, when the descriminant is 0 it has a repeated root, so it just touches the curve, if it were to be greater than 0 it would have two roots which means it would no longer be a tangent, if it were less than 0 it would have two complex roots, not being a tangent,

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

    • 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.