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

lornbeach Group Title

Simplify the given expression:

  • one year ago
  • one year ago

  • This Question is Closed
  1. lornbeach Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    • one year ago
    1 Attachment
  2. maym0Re97 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i7/1+9i

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

    thats not an answer choice

    • one year ago
  4. maym0Re97 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What are the choices?

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

    7+7i/2 63+7i/82 -7+7i/2 -63+7i/82

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

    \[ \sqrt{-49} = \sqrt{49 \dot\ -1} = \sqrt{49} \sqrt{-1} = 7i \\(3 + 4i) - (2 - 5i) = (3 - 2) + (4i + 5i) = 1 + 9i \]

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

    I have to agree with @maym0Re97

    • one year ago
  8. maym0Re97 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Lol that's what I got, but it's not an answer choice

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

    i got that answer as well, but it isnt a choice

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

    There's probably an equivalent choice

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

    Multiply top and bottom by 1 - 9i and see what happens

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

    would it be 63+7i/82?

    • one year ago
  13. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    your job is to rewrite in standard form as \(a+bi\) which means do what @hero said

    • one year ago
  14. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\frac{7i}{1+9i}\times \frac{1-9i}{1-9i}\] the denominator is \(1^2+9^2=82\) all the work is in the numerator

    • one year ago
  15. satellite73 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes you have it

    • one year ago
  16. lornbeach Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you(:

    • 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.