Q1:

2025 Slot 3

Identities

Hard

If (x2+1x2)=25\left(x^2+\frac{1}{x^2}\right)=25 and x>0x>0, then the value of (x7+1x7)\left(x^7+\frac{1}{x^7}\right) is

Answer options
Option 4
Correct Answer
Explanation for 2025 Slot 3 QA question 1

Q2:

CAT 2024 Slot 3

Identities

Medium

If (a+b3)2=52+303(a + b\sqrt{3})^2 = 52 + 30\sqrt{3}, where aa and bb are natural numbers, then a+ba + b equals

Answer options
Option 1
Correct Answer
Explanation for CAT 2024 Slot 3 QA question 2

Q3:

CAT 2024 Slot 1

Identities

Hard

Let x, y, and z be real numbers satisfying

4(x2+y2+z2)=a4(x^2 + y^2 + z^2) = a

4(x−y−z)=3+a4(x - y - z) = 3+ a

Then a equals

Answer options
Option 2
Correct Answer
Explanation for CAT 2024 Slot 1 QA question 3

Q4:

CAT 2024 Slot 1

Identities

Hard

If (a+bn)(a+b \sqrt{n}) is the positive square root of (29−125)(29-12 \sqrt{5}), where aa and bb are integers, and nn is a natural number, then the maximum possible value of (a+b+n)(a+b+n) is

Answer options
Option 2
Correct Answer
Explanation for CAT 2024 Slot 1 QA question 4

Q5:

CAT 2023 Slot 3

Identities

Hard

If xx is a positive real number such that x8+1x8=47x^8 + \frac{1}{x^8} = 47, then the value of x9+1x9x^9 + \frac{1}{x^9} is

Answer options
Option 2
Correct Answer
Explanation for CAT 2023 Slot 3 QA question 5

Q6:

CAT 2023 Slot 2

Identities

Medium

If p2+q2−29=2pq−20=52−2pqp^{2}+q^{2}-29=2 p q-20=52-2 p q, then the difference between the maximum and minimum possible value of (p3−q3)\left(p^{3}-q^{3}\right) is

Answer options
Option 2
Correct Answer
Explanation for CAT 2023 Slot 2 QA question 6

Q7:

CAT 2023 Slot 1

Identities

Medium

If xx and yy are real numbers such that x2+(x−2y−1)2=−4y(x+y)x^2 + (x - 2y − 1)^2 = - 4y(x + y), then the value x−2yx - 2y is

Answer options
Option 3
Correct Answer
Explanation for CAT 2023 Slot 1 QA question 7

Q8:

CAT 2021 Slot 2

Identities

Medium

Consider the pair of equations: x2−xy−x=22x^{2}-x y-x=22 and y2−xy+y=34y^{2}-x y+y=34. If x>yx>y, then x−yx-y equals

Answer options
Option 1
Correct Answer
Explanation for CAT 2021 Slot 2 QA question 8

Q9:

CAT 2019 Slot 1

Identities

Medium

The product of two positive numbers is 616616. If the ratio of the difference of their cubes to the cube of their difference is 157:3157: 3, then the sum of the two numbers is

Answer options
Option 1
Correct Answer
Explanation for CAT 2019 Slot 1 QA question 9

Q10:

CAT 2018 Slot 1

Identities

Hard

u2+(u−2v−1)2=−4v(u+v)u² + (u − 2v − 1)² = −4v (u + v). Then the value of u+3vu + 3v is

Answer options
Option 4
Correct Answer
Explanation for CAT 2018 Slot 1 QA question 10

Q11:

CAT 2017 Slot 1

Identities

Medium

If x+1=x2x + 1 = x^2 and x>0x > 0, then 2x42x^4 is

Answer options
Option 4
Correct Answer
Explanation for CAT 2017 Slot 1 QA question 11