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Cubic Equation 2 | CAT Preparation 2024 | Algebra | Quantitative Aptitude

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Advance Algebra by Ravi Prakash | Quantitative Aptitude for CAT 2024
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19 авг 2024

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Комментарии : 82

@Rodha 3 года назад

At 15:40 : 2ac is 2*1*25

@sachinkumarsingh2518 3 года назад

Sir , what is this 2ac , i think it should be 4ac na ??, please reply..🙏

@mindfullmallu7511 3 года назад

@SARTHAK BORA 🤡

@mindfullmallu7511 3 года назад

@SARTHAK BORA 🤡

@arvind109singh 2 года назад

@@sachinkumarsingh2518 it's a condition ig. Not a discriminate

@mr.tembhurne2977 Год назад

@@mindfullmallu7511 correct

@prashantvats4852 3 года назад

You are using 125 instead of 25. So please pine a comment for confirmation..

@humairaalam969 Год назад

Yes isn't that a mistake ? Like c is supposed to be 25 i guess he used the value of d ..

@ROHIT-SHARMA-897 3 года назад

RESPECTED SIR KINDLY CLARIFY ONE DOUBT IN X^3+5X^2+25X+125 2AC SHOULD BE 2*1*25 AND NOT 2*1*125.KINDLY CLEAR THE DOUBT. WITH REGARDS ROHIT SHARMA

@zoro3188 2 года назад

Your perception is correct sir made a little mistake their

@rayzoldyck8044 Год назад

nigga wrote a whole ass application lmao

@namansharma2721 4 месяца назад

Great Job sir. You are a real Hero! Thanks a Million times!

@rajatghosh7272 Год назад

why did we use b^2 - 4ac previously and now its b^2 - 2ac? What's the difference between the two?

@overexcitedladki23 Год назад

It's a condition...not a discriminant

@ShuvamNayak 4 года назад

At 8:01 shouldn’t the equation 3 be equal to -b ?

@vedantmishra3697 4 года назад

Yesss

@kanakh7775 4 года назад

yes sir told it in a different way, like b is negative so value is negative only.

@sreyoshibanerjee5887 2 года назад

Why is the Discriminant of the cubic equation (b^2-2ac) and not (b^2-4ac)? Please help.

@deekshitabora8280 2 года назад

Because that's not the DISCRIMINANT, it's just a condition.

@lazy_sorbet 2 года назад

There's nothing like b^2-2ac like quadratic equation,in cubic equation we have to compare b^2 to 2ac , if it is less then 2 imaginary roots and 1 real root. Else all roots are real.

@yashasharma9963 3 года назад

Thanks for your efforts, Sir.

@Endever10 2 месяца назад

Wlcm😊

@rohankrishna1818 Год назад

Amazing concepts!!! Thank you sir❤️

@vishalrajoriya8557 Год назад

hey can anyone share the descartes sign change rule video link

@Shivam_General_Fitness Год назад

Thanku sir

@hiteshahlawat4886 3 года назад

Sir very nice conceptual video ❤️

@yatinjoshi6802 Год назад

at 11:50 if the roots are non negative then how come the b is -108

@fenzhang Год назад

B is not a root

@naveenkamath907 Год назад

b is not a root it is a coeffiecient of x

@soumadipranjanbiswas1779 Год назад

Hi Sir, Thanks for the series. I wanted to know where is the "Descartes sign change rule" video ?

@MaxwellNaradd Год назад

Did you find it?

@soumadipranjanbiswas1779 Год назад

@@MaxwellNaradd no

@saurabhmishra4953 4 года назад

If apna= beta= gamma= delta=3 Then this root must satisfy the equation of bi-quadratic mentioned here which is not! Can anyone suggest me if I am wrong anywhere ?

@saswatarouth1516 3 года назад

I think you have done something wrong in the calculations

@sachinkumarsingh2518 3 года назад

Answer of the eqn by putting x=1(let's say), its coming out to be equal to 16 instead of 0 & by putting X=2 , Eqn. equals to 1 , why so ????? Can anyone clarify this doubt ...

@amanvarma4839 10 месяцев назад

Wrong Calculation. It is satisfying. Putting x=3, eq=0

@raghav_daga 2 месяца назад

What is the use of calculating the value of one root among the three roots in the last question? How will that help to solve the question further?

@sidharthnair881 Месяц назад

Then you use that factor(E.g. if 1 is a root, (x-1) is a factor) and divide the whole cubic equation by this factor using long division method to get a quadratic equation. Then solve the quadratic to find the other 2 roots.

@therevealer672 Месяц назад

You can use synthetic division method to reduce the equation to quadratic and solve quadratic for other two roots.

@ss590 10 месяцев назад

Thankyou 💜 so much sir 🙏🏻

@cumulusmusic100 11 месяцев назад

Thank you Sir🙏

@academics7471 5 лет назад

At 15:55 should c be eual to 25 instead of 125?

@raviprakash6021 5 лет назад

Yeah .. thanks for figuring it out.. we have recorded more than 300 videos, so even after reviewing there can be small errors in around 5% of the videos . I will again review and I will put an ERRATA comment for correction.

@SiddharthBasu100 5 лет назад

@@raviprakash6021 Please upload more videos. Less than 3 months for CAT 2019.

@manjunathm7987 4 года назад

yes

@Sanchofan1 4 года назад

@@raviprakash6021 thank s sir for all your efforts.

@avinashnair8433 4 года назад

@@raviprakash6021 Thanks Sir for the effort and time you had put to make us understand the topic. :)

@dakshpatel2839 11 месяцев назад

Thank you so much sir

@shekharankiya2414 Год назад

Why we can take abcd as the roots instead of alpha gama bita?? Abcd = 3*3*3*3 B= 3 A=3

@saisanthoshr464 4 года назад

At 14.17... The discriminant of cubic equation is b^2-3ac and not 2ac...

@avinashnair8433 4 года назад

Well That's not at all a discriminant he is saying. That's just a condition.

@sapeduworld 4 года назад

At 11:13 now he has taken minus sign where as in last video he took positive sign😕😕😕

@avinashnair8433 4 года назад

@@sapeduworld Here the condition is different. Here we have four roots while in the last video we had 3 roots. Actually u need to understand properly how those roots are being evaluated!! Similarly when we will have 5 roots and 6 roots, it will be different. Try to understand the pattern properly. So that u know what will be for n no. of roots!!

@sapeduworld 4 года назад

@@avinashnair8433 Bro plz tell from where i can get more info about how these roots work...plz send the link if any

@avinashnair8433 4 года назад

@@sapeduworld Watch Ravi Sir's introduction video of Cubic Equation. Sir explained those concepts really well 🙂

@KuNjAcHaNBasil 4 года назад

Thank you.

@ypoojaa 2 года назад

thank u sir❤

@soumadipranjanbiswas1779 Год назад

I wanted to know where is the "Descartes sign change rule" video ? Can you please help ?

@samaymohale3050 3 года назад

At 15 condition is not satisfying for eqn x^3+2x^2-3x-10=0 ....which has one real root at x=2 and 2img roots

@sachinkumarsingh2518 3 года назад

Dear Sir, Good Morning At 8:40 , facing problems till the end of this question, because after putting the values in the equation, values doesn't satisfy the equation, please check once..

@ritikagaddellu7938 2 года назад

Nope..equation satisfies✅✅

@smitpatil1584 Год назад

b must be negative

@samparkestates-kr9od 10 месяцев назад

hi. Can anyone pls share the cubic equation part 3 link... The playlist has cubic equation part 3 but it has quadratic eqn lecture.

@Dev-jp4rn 9 месяцев назад

There is only 2 video of cubic eqn

@subhasmitabehera2947 4 года назад

Discriminant is b^2 - 4ac na...

@sachinkumarsingh2518 3 года назад

Yaar wahi toh yahan 4ac hona chaahiye na, bahut confuse ho gya iss video me...If you got proper explanation of this 2ac , please reply ..

@jaideepsingh4395 3 года назад

@@sachinkumarsingh2518 bhai ye discriminant nahi hai ye bas ek condition hoti hai jo cubic equation pe apply hoti hai. Or wo jo b^2-4ac hota hai vo bas quadratic equation ke liye hota hai.

@jaidevtyagi1033 10 месяцев назад

Sir in the first eqn the roots are p,q,r. Now at x=1 the equation satisfy. one of the roots is 1. whatever we add to 1 we'll get the answer as greater than 1, then how can the answer be 0.25

@jaidevtyagi1033 10 месяцев назад

Ok so the question is wrong as 1 root is real and two are imaginary ✌️. Discriminant= -4