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Yahoo!

  • 3 years ago

The number of real roots of eq 3x^5 + 10x^3 + 30x + 7 =0 ?

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  1. Yahoo!
    • 3 years ago
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    @mukushla @experimentX @Ishaan94

  2. alanli123
    • 3 years ago
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    Solve it bro

  3. Yahoo!
    • 3 years ago
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    Any clue @alanli123

  4. alanli123
    • 3 years ago
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    Or graph it?

  5. alanli123
    • 3 years ago
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    then look at x intercepts?

  6. Yahoo!
    • 3 years ago
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    i wabt to solve this manually not by graph

  7. alanli123
    • 3 years ago
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    Ok use the rational roots theorem and plug in possible root values

  8. Yahoo!
    • 3 years ago
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    wat is that

  9. alanli123
    • 3 years ago
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    bro how old are u

  10. Ishaan94
    • 3 years ago
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    my guess is only one. and that one root should be negative.

  11. Ishaan94
    • 3 years ago
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    i used descartes rule of signs.

  12. Yahoo!
    • 3 years ago
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    hw u guys are using that rule can u teach me that @Ishaan94

  13. Yahoo!
    • 3 years ago
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    i think that method is very easy!

  14. Ishaan94
    • 3 years ago
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    i can link you, http://mathworld.wolfram.com/DescartesSignRule.html. yes it's quite easy.

  15. Yahoo!
    • 3 years ago
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    it says file not found @Ishaan94

  16. Yahoo!
    • 3 years ago
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    nop i got it

  17. Ishaan94
    • 3 years ago
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    haha really? try again, http://mathworld.wolfram.com/DescartesSignRule.html

  18. Yahoo!
    • 3 years ago
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    @Ishaan94 that helps a lot.....i am happy that i learnt new concept ....thxx

  19. Yahoo!
    • 3 years ago
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    since there is no change of sign it does not have any + ve roots

  20. Yahoo!
    • 3 years ago
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    is that correct

  21. Ishaan94
    • 3 years ago
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    yes

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