CAT 2020 Question Paper | Quants Slot 1

CAT Previous Year Paper | CAT Quants Questions | Question 6

Solving questions from Linear and Quadratic equations is an integral part of your CAT preparation. In CAT Exam, one can generally expect to get 1~2 questions from Linear Equations and Quadratic Equations. In this question, we have to find the number of real-valued solutions. Would something conventional work or, do we have to take some non-formulaic approach? Find it out yourself. Time to have a go at this question, and then check out the video solution to find out how Rajesh solves this question!

Question 6 : The number of real-valued solutions of the equation 2x + 2-x = 2 - (x - 2)2 is

  1. infinite
  2. 0
  3. 1
  4. 2

🎊 Independance Day Discount!
Upto 4,000 off on CAT Online Courses
Valid until 16th Aug


2IIM : Best Online CAT Coaching.


Video Explanation


Best CAT Coaching in Chennai


CAT Coaching in Chennai - CAT 2022
Limited Seats Available - Register Now!


Explanatory Answer

2x + 2-x is of the form y + \\frac{1}{y})
Minimum value the expression can take is ≥ 2
So 2x + 2-x ≥ 2
Now, 2 – (x – 2)2 ----> (x – 2)2 is ≥ 0
So 2 – (x – 2)2 ≤ 2 (From 2 we are subtracting a non-negative number)
Maximum value the expression can have is 2
The only possibility is both sides are = 2
If value = 2
Then x = 0
20 + 20 = 2 – (0 – 2)2
2 ≠ – 2
There is no case where LHS = RHS = 2
Hence 0 real-valued solutions


The question is "The number of real-valued solutions of the equation 2x + 2-x = 2 - (x - 2)2 is"

Hence, the answer is, "0"

CAT Questions | CAT Quantitative Aptitude

CAT Questions | CAT DILR

CAT Questions | Verbal Ability for CAT


Where is 2IIM located?

2IIM Online CAT Coaching
A Fermat Education Initiative,
58/16, Indira Gandhi Street,
Kaveri Rangan Nagar, Saligramam, Chennai 600 093

How to reach 2IIM?

Phone: (91) 44 4505 8484
Mobile: (91) 99626 48484 / 94459 38484
WhatsApp: WhatsApp Now
Email: info@2iim.com