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iwanttogotostanford

  • one year ago

ALGEBRA II HELP: Which of the following is the conjugate of 10 − 3i?

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  1. anonymous
    • one year ago
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    change the sign in front of the imaginary part to find the conjugate

  2. anonymous
    • one year ago
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    (a + bi and (a - bi) are conjugates

  3. anonymous
    • one year ago
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    It would be 10+3i For example Conjugates: 3-2i, 3+2i

  4. campbell_st
    • one year ago
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    remember part of the general quadratic formula \[-b \pm \sqrt{b^2 - 4ac}\] so if you think about \[3 \pm \sqrt{-4} = 3 \pm 2i\] so the integer doesn't change its just the sign of the imaginary part

  5. campbell_st
    • one year ago
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    its also like the difference of 2 squares how do you get a 2 term quadratic (a -b)(a +b) = a^2 - b^2

  6. iwanttogotostanford
    • one year ago
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    sorry, my wi-fi went out for awhile @campbell_st @twistnflip @peachpi

  7. iwanttogotostanford
    • one year ago
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    so i would want to do the opposite for this one?

  8. iwanttogotostanford
    • one year ago
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    what is the first step?

  9. anonymous
    • one year ago
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    Yes the conjugates are easy. just switch the sign from positive to negative or vice versa. Here the conjugate is 10+3i

  10. iwanttogotostanford
    • one year ago
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    so it would be 13i?

  11. iwanttogotostanford
    • one year ago
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    wow I'm being stupid

  12. anonymous
    • one year ago
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    Nope do you have answer choices. It wouldn't be 13i because you can't add the two terms because one has a variable and the other does not lol

  13. anonymous
    • one year ago
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    The answer is 10 + 3i <-- Final answer

  14. iwanttogotostanford
    • one year ago
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    i get it the question was just asking for the conjugate so its 10+3i

  15. iwanttogotostanford
    • one year ago
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    my answer choices are

  16. iwanttogotostanford
    • one year ago
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    10 + 3i 10 − 3i 3 + 10i 3 − 10i

  17. anonymous
    • one year ago
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    a.

  18. anonymous
    • one year ago
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    Make sense?

  19. iwanttogotostanford
    • one year ago
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    thanks for helping me better understand, everyone!

  20. iwanttogotostanford
    • one year ago
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    yep, makes perfect sense

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