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anonymous

  • one year ago

Which of the following is a polynomial with roots 5, 7, and −8? f(x) = x3 − 35x2 − 56x + 61 f(x) = x3 − 35x2 − 61x + 280 f(x) = x3 − 4x2 − 35x + 56 f(x) = x3 − 4x2 − 61x + 280

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  1. anonymous
    • one year ago
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    @MrNood @OregonDuck

  2. OregonDuck
    • one year ago
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    f(x) = (x-5)(x-7)(x+8) = (x-5)(x^2+x-56) = x^3+x^2-56x-5x^2-5x+280 f(x) = x^3-4x^2-61x+280 So the answer is d

  3. anonymous
    • one year ago
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    how did you do that so fast

  4. anonymous
    • one year ago
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    are you super man?

  5. OregonDuck
    • one year ago
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    cause this stuff is easy

  6. OregonDuck
    • one year ago
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    i can do pre calculus in 7th grade

  7. OregonDuck
    • one year ago
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    i am only 12 fyi

  8. anonymous
    • one year ago
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    so you are super man

  9. anonymous
    • one year ago
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    mind helping me with one more

  10. MrNood
    • one year ago
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    however - @OregonDuck all oyu have given the poster is the knowledge that YOU can solve this question what iwould be truly helpful would be to show HOW to solve it - then let HIM do the work you learn better by DOING than by watching

  11. OregonDuck
    • one year ago
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    sure :)

  12. anonymous
    • one year ago
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    Which of the following is a polynomial with roots 4, 2i, and −2i? f(x) = x3 − 4x2 + 8x − 4 f(x) = x3 − 8x2 + 16x − 4 f(x) = x3 − 4x2 + 4x − 16 f(x) = x3 − 4x2 + 8x − 16

  13. MrNood
    • one year ago
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    wait!

  14. OregonDuck
    • one year ago
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    WHAT?!?

  15. MrNood
    • one year ago
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    if the roots are a,b & c then the factors are (x-a)(x-b)(x-c) if you put your three roots into that formula then mutiply out the 23 brackets you will come to the answer YOURSELF

  16. OregonDuck
    • one year ago
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    Work backwards for each root to get the factor.. (x - 4)(x - 2i)(x + 2i) Distribute.. (x - 4)(x² - 4i²) = (x - 4)(x² + 4) [Noting that i² = -1] = x³ - 4x² + 4x - 16 [A]

  17. MrNood
    • one year ago
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    if the roots are a,b & c then the factors are (x-a)(x-b)(x-c) if you put your three roots into that formula then mutiply out the 3 brackets you will come to the answer YOURSELF

  18. anonymous
    • one year ago
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    ya i got that to

  19. OregonDuck
    • one year ago
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    it is a

  20. OregonDuck
    • one year ago
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    wait no it is c sorry i was reading mine post i put a for some reason lol

  21. MrNood
    • one year ago
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    @OregonDuck Once again - juist showing that YOU know how to do this type of questin. LET the poster do some of the calculation - he will actually LEARN from that instead of copying

  22. anonymous
    • one year ago
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    im working it out as well mrnood

  23. OregonDuck
    • one year ago
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    he will learn my failing the dba or segment exams cause you need your notes and memory to help you

  24. anonymous
    • one year ago
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    i am taking these problems down as notes

  25. anonymous
    • one year ago
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    so i can learn to do the harder ones

  26. OregonDuck
    • one year ago
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    EXACTLY SEE ^^^^^^^^

  27. MrNood
    • one year ago
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    but until you do one yourself you will not be sure that oyu UNDERSTAND how to do it you do not need to learn 'harder' questions - you need to learnt the METHOD - then oyu can do ALL questions

  28. anonymous
    • one year ago
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    i did 8 out of the 10 of my practice questions @MrNood but just needed help for these two

  29. OregonDuck
    • one year ago
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    FINE ASK HIM FOR HELP NOT ME AL LEAST I SHOWED MY WORK!!!!!!!

  30. anonymous
    • one year ago
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    Please dont fight @OregonDuck and @MrNood

  31. MrNood
    • one year ago
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    Don't get in a sulk Just try to help posters to learn rather than going right through to tthe answer

  32. anonymous
    • one year ago
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    thank you @MrNood and @OregonDuck

  33. OregonDuck
    • one year ago
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    yeah your welcome

  34. MrNood
    • one year ago
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    YOU'RE welcome

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