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

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  • Опубліковано 4 вер 2024
  • Advance Algebra by Ravi Prakash | Quantitative Aptitude for CAT 2024
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КОМЕНТАРІ • 56

  • @sumitad5271
    @sumitad5271 5 років тому +10

    At 8:00 y axis will be shifted towards left instead of the way u depicted the y axis..because the parabola will cut the y axis at (0,4) (y intercept is 4)

  • @therd2561
    @therd2561 19 днів тому +1

    m=2,6,12,20,30,42,56,72,90,110,132,156,182.
    If you notice difference of each consecutive value of m makes an AP :
    4,6,8,10......
    So you can calculate values of m using formula of sum of AP 😊

  • @srinidhimishra238
    @srinidhimishra238 2 роки тому +14

    SHRIDHARACHARYA FORUMLA

  • @arimachezhian8631
    @arimachezhian8631 Рік тому +4

    At 7:45 The root is 2 so the graph's intersection must fall in the 1st quadrant and not the second

  • @careerroute392
    @careerroute392 2 роки тому +7

    When sir say I hope you you remember this formula at your childhood
    🤪I was like - e ka bol diyee sir g 😂

  • @BhavoukHCH
    @BhavoukHCH 8 місяців тому +2

    AT 11.50 UNDERROOT A SQAURE WILL BE A

  • @Karmyogibro
    @Karmyogibro 4 роки тому +11

    18:14 but we can tak 28² also instead of 27²....28²=784

    • @Herehere2120
      @Herehere2120 4 роки тому +21

      But the equation satisfies only odd numbers, as the equation is (4m+1), which is odd. So we will take only upto 729(which is odd) and not 784(which is even)

    • @Karmyogibro
      @Karmyogibro 4 роки тому +3

      @@Herehere2120 thanks 🙂

    • @sachinnaik3066
      @sachinnaik3066 Рік тому

      ​@@Herehere2120which college did u get

    • @monishmoolya8919
      @monishmoolya8919 Рік тому +8

      ​@@sachinnaik3066 IIM dholakpur

  • @mbagirl03
    @mbagirl03 28 днів тому

    Thank u soo much sir...

  • @addibel506
    @addibel506 Рік тому +1

    12:30 example

  • @satyanarayaniitkgp3484
    @satyanarayaniitkgp3484 2 місяці тому

    THANK YOU SIR !!!

  • @Krishnaki1111
    @Krishnaki1111 9 місяців тому

    Thank you so much sir!

  • @yatigehlot8069
    @yatigehlot8069 3 роки тому +2

    Tq sir 🔥

  • @seeker8672
    @seeker8672 2 роки тому +2

    hello sir, in the last question the roots can be rational if D = 0 . If we apply that we get m = - 0.25 . Where's the error?

    • @soubhagyashukla8460
      @soubhagyashukla8460 2 роки тому +6

      M has to be natural number it is mentioned in question !

  • @cumulusmusic100
    @cumulusmusic100 Рік тому

    Thank you Sir

  • @Snehsinghajpoot45
    @Snehsinghajpoot45 29 днів тому +1

    At 18:27 why you does nt include 1²as possible value of m please explain

    • @archit8069
      @archit8069 22 дні тому

      watch 19:50 sir changed the question thats why you cant take 1^2

    • @praveen-bt1cw
      @praveen-bt1cw 5 днів тому +1

      since 'm' is a natural number and you cant take 1^2 because it requires m=0

    • @jhawaraditi10
      @jhawaraditi10 4 дні тому

      Not understood plz explain in detail​@@praveen-bt1cw

  • @Shivam_General_Fitness
    @Shivam_General_Fitness Рік тому

    Thanku sir

  • @Fillerkat
    @Fillerkat Рік тому +1

    19:49 y we didn't took m=0 and d as 1² ie 1 1 is also a rational no. Total values should be 14. Please correct me if m wrong

    • @thakuryadansh
      @thakuryadansh Рік тому +2

      If we take D=1, then M will be 0 and it's given that M is a Natural no. , And 0 is not a natural no.

    • @shivanshu5702
      @shivanshu5702 Рік тому

      Also the equation will become 0 itself and hence no such thing as rational roots in that case

    • @shyamp314
      @shyamp314 Рік тому

      For a quadratic equation coefficient of square term should not be zero.
      Otherwise it will become a linear equation.I think.

    • @mbagirl03
      @mbagirl03 28 днів тому

      Sir says leaving 1

  • @shubhanshisinghms7745
    @shubhanshisinghms7745 2 роки тому +1

    Thankyou, Sir! :)

  • @anandkrishna9661
    @anandkrishna9661 2 місяці тому +3

    Apa puriyalaa Ippo puriyudhuu........
    - School days (TAMIL PEOPLE CAN UNDERSTAND) 🤣

  • @debangshudeb9778
    @debangshudeb9778 4 роки тому +3

    Why to leave 1

    • @samaymohale3050
      @samaymohale3050 4 роки тому +6

      Because m belongs to natural no, thats y we cannot take m as 0 which in turn makes 4m+1=1 or 1^2

    • @vk1512
      @vk1512 Рік тому

      M cannot be zero

  • @jaikishanyadav79
    @jaikishanyadav79 Рік тому

    can someone please explain that how am i supposed to know where to use the d formula. like in the last question how will it click that it will be done by knowing the nature of the roots??
    can someone shed light?

    • @kunalgupta2874
      @kunalgupta2874 Рік тому +3

      It said that the roots are rational, so the only way to check the roots are rational is to use the discriminant.
      Also, if you see the question, there is absolutely nothing that you can do except to start approaching the question using discriminant.

    • @shubhkarm14
      @shubhkarm14 Рік тому

      When the Q asks for nature of roots

  • @aniketjaiswal7661
    @aniketjaiswal7661 4 роки тому +6

    @18:14 'm' should be less than 200 i.e, m=199.and therefore, D=797, please correct me if I am wrong .

    • @prakhargalgale5048
      @prakhargalgale5048 4 роки тому +1

      797 is not a perfect square. We need to find values of 'D' which are perfect squares.

    • @nef_nef
      @nef_nef 4 роки тому

      Still the answers will be same

    • @pavithran5515
      @pavithran5515 3 роки тому

      Even if we consider 199 ans will be same

    • @hannahanneabraham97
      @hannahanneabraham97 2 роки тому +4

      You can't take m=199.
      m less than 200 means the values of m should not exceed 200. Not that m has values till 199.
      We can see this by looking at the first few values of D, such as D = 1 squared, 3 squared, 5 squared etc.
      Here m = 2, 6, 12. We can't take m = 3, 4, 5, 7 etc.
      Therefore m

    • @deekshitabora8280
      @deekshitabora8280 2 роки тому +1

      @@hannahanneabraham97 the condition given is m

  • @anamikakapoor4745
    @anamikakapoor4745 4 роки тому +3

    Why is it that you haven't considered 1^2 as 1^2 is also an odd square and you get m=0 which doesn't violatie the condition m

    • @akshayt1432
      @akshayt1432 4 роки тому +7

      M is natural number. D will take value of 1^2 only when m is 0. But 0 is not a natural number hence the didn't consider 1^2

    • @anamikakapoor4745
      @anamikakapoor4745 4 роки тому +1

      @@akshayt1432 got it , thanks

  • @sandhyajaganathan
    @sandhyajaganathan 3 місяці тому

    Why are we not counting 1 square in our solution.one is also a perfect square.

    • @prateekbirthal9649
      @prateekbirthal9649 3 місяці тому

      Because for 1, in 4m+1, m will have to be 0 but m can only be a natural number

  • @pandikumar5257
    @pandikumar5257 Рік тому

    Hi. How you all are telling 4m+1 is odd. I don't understand thjs point

    • @zalakmajithiya5173
      @zalakmajithiya5173 Рік тому

      odd numbers are always in the form of 2m + 1 / 2m -1 .It means 4m + 1 bhi odd number hua na .You can also check by yourself.

    • @lakshmi8906
      @lakshmi8906 Рік тому

      @@zalakmajithiya5173 but 7 is not of the form 4m+1

    • @zalakmajithiya5173
      @zalakmajithiya5173 Рік тому +2

      @@lakshmi8906 i just said that ALL 2m +1 and 2m -1are odd numbers.
      It also means that 4m +1 /4m -1 can also be odd numbers.
      Ex : if m is 2 then 4m +1 = 9 .
      Ya ofcourse not ALL the odd numbers are 4m+1 but jitne bhi number is formula se aa saktey hai vo odd hi haina .
      Use common sense.

    • @nish9927
      @nish9927 Рік тому

      @@zalakmajithiya5173 why we didnt take 1. there should be 14 values na ??

    • @Y.uvraj.
      @Y.uvraj. Рік тому +1

      @@nish9927 if we take 1 than m will be 0 which is not a natural number