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Special Cases
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This lesson deals with some special types of questions. These questions often confuse the students in the exam. This lesson tells the ways to master these types of questions.

Abhishek Kumar
Love to explore life| UPSC Aspirant| Cleared SBI PO| Cleared BOB PO| NDA, AFCAT exam| Attended SSB thrice| Worked as Software engineer IBM

U
Unacademy user
Thnxxx for ur effort.
Nikhil Sharma
a year ago
Thanks Manoranjan
Sir if both options comes CND & no relation then? Which one we should opt?
many many thanks ...... providing such an unbelievable method....really it ll help me in SBI po...please sir send such a valuable and time consuming methods....
brief and nicely explained. must watch by all. way to go.
  1. Quadratic equation Presented by: Abhishek Kumar


  2. About me: Cleared Bank Of Baroda PO Cleared SSC CHSL Cracked NDA,AFCAT exam Attended SSB thrice Currently working in IBM India Follow me: https://unacademy.com/userlAbhishek_kr Contribute


  3. Special Cases: Type:1 SQUARES X2 = 1600 y2 = 1600 Answer is CND. Because, a square would always mean possibility of a positive as well as negative value, x = 40,-40 y = 40.40 Hence, any 2 squares or their variations are always CND, irrespective of the values.


  4. Example:2 X2-243 = 468 y: + 513 = 1023 Don't touch the pen. Its a CND. Because, ultimately we'll get a perfect/ imperfect square, which is always a CND


  5. e. EQUATIONS Example:5x 4y 92 4x+2y = 64 Soln: 8x+4y = 128. 8x + 4y = 128 5x + 4y = 92 3x = 36 X=12 y=8 So, X > Y is right here.


  6. Type 3: Involving roots QF-N3x-54 = 0; y2+2y-24 = 0


  7. QF-7V3x-54 = 0; y2 +y2y-24 = 0 5 -94 2J3 2


  8. 2 22 4-


  9. Q.x?_7V3x-54 = 0; y2+2y-24 = 0 2 2 2 5 2 4- "Y2+ 127-302 7-2420


  10. Q.x?_7V3x-54 = 0; y2+2y-24 = 0 2 2 2 5 2 4- "Y2+ 127-302 7-2420 CND