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sara1234

  • 2 years ago

Write the product in standard form.

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  1. sara1234
    • 2 years ago
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    ( 9 + 5i)( 9 + 8i)

  2. ilikephysics2
    • 2 years ago
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    41+117i

  3. sara1234
    • 2 years ago
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    Steps?

  4. Kat.Tvb
    • 2 years ago
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    18 =13I

  5. ilikephysics2
    • 2 years ago
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    the foiling method, do you know what that is?

  6. sara1234
    • 2 years ago
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    what do you do after (9*9)+(9*5i)+(9*8i)+(8i*5i)

  7. sritama
    • 2 years ago
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    (a+b)(c+d)=ab+bc+ad+bd

  8. ilikephysics2
    • 2 years ago
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    oh i just did it on the calculator, thats all you do there really is no steps

  9. sritama
    • 2 years ago
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    multiply them

  10. sritama
    • 2 years ago
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    do you know the meaning of i ?

  11. ilikephysics2
    • 2 years ago
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    look im write ok

  12. sara1234
    • 2 years ago
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    81+157i i got this and i know its wrong can you khow steps so i can compare?

  13. sritama
    • 2 years ago
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    81+45i+72i-40

  14. ilikephysics2
    • 2 years ago
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    i gave you the right answer

  15. sara1234
    • 2 years ago
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    isnt it 40i

  16. sritama
    • 2 years ago
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    i^2=-1

  17. ilikephysics2
    • 2 years ago
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    can i get my metal now ;)

  18. sara1234
    • 2 years ago
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    i know you gave me the right answer but i need to know what i did wrong because i didnt get that

  19. hartnn
    • 2 years ago
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    i is the square root of -1 so i*i = -1

  20. phi
    • 2 years ago
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    (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

  21. sara1234
    • 2 years ago
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    why 40^2?

  22. ilikephysics2
    • 2 years ago
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    its 117i, phi you got it wrong

  23. sritama
    • 2 years ago
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    @ilikephysics2 is correct

  24. hartnn
    • 2 years ago
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    thats why 8i * 5*i = 40 i*i =40 *(-1)= -40

  25. phi
    • 2 years ago
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    typo, 117i

  26. sara1234
    • 2 years ago
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    i got it thanks guys just one questions why you do 40 ^2

  27. phi
    • 2 years ago
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    it is 40 times i*i i^2 which is -1

  28. phi
    • 2 years ago
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    so do FOIL, but with the trick that i*i can be replaced with -1

  29. sara1234
    • 2 years ago
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    oh thank you @phi so when ever its i*i you have to change it to a negative?

  30. phi
    • 2 years ago
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    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

  31. sara1234
    • 2 years ago
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    okay i get it thanks to all

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