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anonymous

  • 4 years ago

Solve.. 3x^3 - 23x^2 +7x +5

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  1. anonymous
    • 4 years ago
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    \[ (1+3 x) \left(5-8 x+x^2\right) \]

  2. anonymous
    • 4 years ago
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    Hi Math, how do we solve this?

  3. Hero
    • 4 years ago
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    Good job posting the steps Fool

  4. anonymous
    • 4 years ago
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    i mean what is x equal to?

  5. anonymous
    • 4 years ago
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    i think i know the answer now :) thanks!

  6. Hero
    • 4 years ago
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    cherrydrops, in order to solve it, it has to be an equation. What you have posted is simply an expression.

  7. anonymous
    • 4 years ago
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    are there 3 answers for x? omg the expression has an ' = 0 ' at the right. oops!

  8. Hero
    • 4 years ago
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    ya, you forgot to include the = 0

  9. anonymous
    • 4 years ago
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    thank you

  10. Hero
    • 4 years ago
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    FFM, do you mind posting the steps?

  11. anonymous
    • 4 years ago
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    I.. don't think he's there :)

  12. Hero
    • 4 years ago
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    Yeah, he magically disappeared without posting the steps

  13. anonymous
    • 4 years ago
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    Heheh. yeah :(

  14. Hero
    • 4 years ago
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    Okay, I have it finally

  15. Hero
    • 4 years ago
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    Are you ready for the steps?

  16. Hero
    • 4 years ago
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    3x^3-23x^2+7x+5 3x^3-24x^2+x^2+15x-8x+5 3x^3-24x^2+15x+x^2-8x+5 3x(x^2-8x+5)+1(x^2-8x+5) (x^2-8x+5)(3x+1)

  17. Hero
    • 4 years ago
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    Tedious, but it works

  18. anonymous
    • 4 years ago
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    wow.. ;) thanks

  19. Hero
    • 4 years ago
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    now you can do this: (x^2-8x+5)(3x+1) = 0 x^2-8x + 5 = 0 3x+1 = 0 and solve for x

  20. anonymous
    • 4 years ago
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    Aahh i'm lost even before i got to the third step.. ;l how did 3x^3-23x^2+7x+5 become 3x^3-24x^2+x^2+15x-8x+5?

  21. Hero
    • 4 years ago
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    -24x + x^2 = -23x 15x-8x = 7x

  22. anonymous
    • 4 years ago
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    right... ;

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spraguer (Moderator)
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