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iheartfood

  • 3 years ago

Solve the polynomial equation... (inside!) Please show work!! and explain! Thanks!! :)

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  1. iheartfood
    • 3 years ago
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    |dw:1352180620990:dw|

  2. .Sam.
    • 3 years ago
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    You have to find one root, then use long division to factor the polynomial.

  3. iheartfood
    • 3 years ago
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    can u please show me how? idk how to find it :(

  4. .Sam.
    • 3 years ago
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    Are you allowed to use a scientific calculator in your exams?

  5. iheartfood
    • 3 years ago
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    yes I'm allowed to :) this is a practice worksheet and i need to show my work :/ and idk how to solve much less show work lol :/

  6. iheartfood
    • 3 years ago
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    do u understand how to solve this? cuz i am lost :(

  7. .Sam.
    • 3 years ago
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    I would use trial an error from calculator, you key the equation into your calculator, then substitute any number for x and see if its equal to zero, if that value of x equals to zero, then that is the factor of the polynomial

  8. .Sam.
    • 3 years ago
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    Ok, according to the trial an error, x=8 works, so, f(8)=15(8)^3-119(8)^2-10(8)+16=0

  9. .Sam.
    • 3 years ago
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    Now, x=8, (x-8) is a factor of that polynomial. then use this to find other factors, by long division.

  10. iheartfood
    • 3 years ago
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    so, what exactly am i dividing?? and can you please type or draw out all the work in order?? :) i understand better that way :)

  11. .Sam.
    • 3 years ago
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    You are dividing (x-8)

  12. .Sam.
    • 3 years ago
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    Because x=8 for the f(x) is zero

  13. iheartfood
    • 3 years ago
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    okay, so I'm dividing 15x^3-119x^2-10x+16 divided by x-8?

  14. .Sam.
    • 3 years ago
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    Yes

  15. iheartfood
    • 3 years ago
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    k i got 15x^2+x-2... so is that my answer?? :)

  16. iheartfood
    • 3 years ago
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    @.Sam. is that my answer???

  17. .Sam.
    • 3 years ago
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    yes

  18. iheartfood
    • 3 years ago
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    kk thanks! :)

  19. iheartfood
    • 3 years ago
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    can u pls help me with another one>? :)

  20. .Sam.
    • 3 years ago
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    But if they tell you to solve, that means you have to find x from 15x^2+x-2

  21. .Sam.
    • 3 years ago
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    Use factor or quadratic equation or completing the square to solve 15x^2+x-2

  22. iheartfood
    • 3 years ago
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    kk thanks!! :)

  23. .Sam.
    • 3 years ago
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    welcome

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