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

sara1234 Group Title

Write the product in standard form.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ( 9 + 5i)( 9 + 8i)

    • 2 years ago
  2. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    41+117i

    • 2 years ago
  3. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Steps?

    • 2 years ago
  4. Kat.Tvb Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    18 =13I

    • 2 years ago
  5. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the foiling method, do you know what that is?

    • 2 years ago
  6. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    what do you do after (9*9)+(9*5i)+(9*8i)+(8i*5i)

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

    (a+b)(c+d)=ab+bc+ad+bd

    • 2 years ago
  8. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    oh i just did it on the calculator, thats all you do there really is no steps

    • 2 years ago
  9. sritama Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    multiply them

    • 2 years ago
  10. sritama Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do you know the meaning of i ?

    • 2 years ago
  11. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    look im write ok

    • 2 years ago
  12. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    81+157i i got this and i know its wrong can you khow steps so i can compare?

    • 2 years ago
  13. sritama Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    81+45i+72i-40

    • 2 years ago
  14. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i gave you the right answer

    • 2 years ago
  15. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    isnt it 40i

    • 2 years ago
  16. sritama Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i^2=-1

    • 2 years ago
  17. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    can i get my metal now ;)

    • 2 years ago
  18. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i know you gave me the right answer but i need to know what i did wrong because i didnt get that

    • 2 years ago
  19. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i is the square root of -1 so i*i = -1

    • 2 years ago
  20. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    (9*9)+(9*5i)+(9*8i)+(8i*5i) 81 +45i +72i+40i^2 i^2 is -1 so 81-40 + (45+72)i simplify 41+112i

    • 2 years ago
  21. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    why 40^2?

    • 2 years ago
  22. ilikephysics2 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    its 117i, phi you got it wrong

    • 2 years ago
  23. sritama Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @ilikephysics2 is correct

    • 2 years ago
  24. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    thats why 8i * 5*i = 40 i*i =40 *(-1)= -40

    • 2 years ago
  25. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    typo, 117i

    • 2 years ago
  26. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i got it thanks guys just one questions why you do 40 ^2

    • 2 years ago
  27. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    it is 40 times i*i i^2 which is -1

    • 2 years ago
  28. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    so do FOIL, but with the trick that i*i can be replaced with -1

    • 2 years ago
  29. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh thank you @phi so when ever its i*i you have to change it to a negative?

    • 2 years ago
  30. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    yes. i is short for sqrt(-1) sqrt(-1)*sqrt(-1)= -1 so keep i's but replace i*i (or i^2) with -1

    • 2 years ago
  31. sara1234 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    okay i get it thanks to all

    • 2 years 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.