A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ashking1

  • one year ago

can someone help me Write the expression in standard form.

  • This Question is Closed
  1. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\frac{ 5 }{ 3-15i }\]

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

    standard form is ax+by=c

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

    standrd form should be a + bi

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

    Oh I am thinking of a graph yeah I think you are right @d3v13

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

    so basically multiply both the sides by something to get that form

  6. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so what do i multiply it by

  7. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    (3 + 15i )/(3 + 15i) recall i^2 = -1

  8. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\frac{ 5 }{ (3-15i )}*\frac{ (3 + 15i) }{ (3 + 15i) } =\]

  9. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    You don't want an imaginary number in the bottom, so switch the sign and multiply by the conjugate thing

  10. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you good ?

  11. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oa ya but how does that equal to a fraction \[\frac{ 5 }{ 78 } -\frac{ 25 }{ 78}i\] \[\frac{ 5 }{ 78 } +\frac{ 25 }{ 78}i\] \[-\frac{ 5 }{ 78 } +\frac{ 25 }{ 78}i\] \[-\frac{ 5 }{ 78 } -\frac{ 25 }{ 78}i\] these are my choices

  12. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you need to multiply those two fractions ...

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

    \[\frac{ 5(3+15i) }{ (3-15i)(3+15i) }=\]

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

    remember i^2 = -1

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

    \[\frac{ 5(3+15i) }{ (3-15i)(3+15i) }= \frac{ 15 + 75 i }{9 -15i + 15i -225*(-1) } =\]

  16. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    whats next?

  17. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok i got that

  18. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\frac{ 15 + 75i }{ 234 }\]

  19. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    just have to reduce the fractions.

  20. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\frac{ 15 + 75 i }{9 + 225 }\]

  21. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    234 sorry

  22. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\frac{ 15 + 75i }{ 234 } = \frac{ 15 }{ 234 } + \frac{ 75i }{ 234 }\]

  23. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    simplify

  24. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, just reduce the fractions

  25. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\frac{ 5 }{ 78 } +\frac{ 25 }{ 78}i\]

  26. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yep, standard form --- a + b*i

  27. ashking1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks

  28. DanJS
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    welcome

  29. 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.