A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

How do I convert y-5=-2(x+1)^2 to intercept form? The standard form is y=-2x^2-4x+3!

  • This Question is Closed
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You might want to check my work over, but if you are trying to get the equation into slope intercept y= mx+b form then these are the steps. First, multiply the quadratic in the parentheses; y-5=-2(x^2+1). then multiply -2; y-5=-2x^2-2. Then add 5 over; y=2x^2+3. I will check this through, but this is my best for now

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

    oops! i meant intercept form as in y=(x-r1)(x-r2)

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

    I tried factoring, but you can't factor it. and I tried the quadratic equation but i'm getting -1+- 2sqrt10 which isn't right i think

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

    If it is not factorizable, then I think you can't convert that equation into Intercept Form..

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

    really? idk i know the intercepts are -2.581 an .581 though

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

    and*

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

    I mean you can't convert, but the person who knows how to convert, that person can convert. :P

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

    Okay, let me try if I am that person or not.. :)

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

    Add 5 both sides first to separate \(y\)...

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

    \(y = -2(x^2 + 1 + 2x) + 5 \implies y = -2x^2 - 4x+ 3\)

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

    Let us go with Quadratic Formula for a moment: \[x_{1,2} = \frac{4 \pm 2\sqrt{10}}{-4} \\ x_{1,2} = -1 \mp \frac{\sqrt{10}}{2}\]

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

    So, yes you are right, you got the two intercepts right..

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

    So: \(y = (x - 0.581)(x + 2.581)\)

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

    ohh i thought i was wrong haha okay thanks:)

  15. 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.