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The number of real roots of eq 3x^5 + 10x^3 + 30x + 7 =0 ?
 2 years ago
 2 years ago
Yahoo! Group Title
The number of real roots of eq 3x^5 + 10x^3 + 30x + 7 =0 ?
 2 years ago
 2 years ago

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Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
@mukushla @experimentX @Ishaan94
 2 years ago

alanli123 Group TitleBest ResponseYou've already chosen the best response.0
Solve it bro
 2 years ago

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Any clue @alanli123
 2 years ago

alanli123 Group TitleBest ResponseYou've already chosen the best response.0
Or graph it?
 2 years ago

alanli123 Group TitleBest ResponseYou've already chosen the best response.0
then look at x intercepts?
 2 years ago

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i wabt to solve this manually not by graph
 2 years ago

alanli123 Group TitleBest ResponseYou've already chosen the best response.0
Ok use the rational roots theorem and plug in possible root values
 2 years ago

alanli123 Group TitleBest ResponseYou've already chosen the best response.0
bro how old are u
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.3
my guess is only one. and that one root should be negative.
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.3
i used descartes rule of signs.
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
hw u guys are using that rule can u teach me that @Ishaan94
 2 years ago

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i think that method is very easy!
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.3
i can link you, http://mathworld.wolfram.com/DescartesSignRule.html. yes it's quite easy.
 2 years ago

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it says file not found @Ishaan94
 2 years ago

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nop i got it
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.3
haha really? try again, http://mathworld.wolfram.com/DescartesSignRule.html
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
@Ishaan94 that helps a lot.....i am happy that i learnt new concept ....thxx
 2 years ago

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since there is no change of sign it does not have any + ve roots
 2 years ago

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is that correct
 2 years ago
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