How to solve XAT 2021 - Dm Question 20?

This question can be solved by applying the core concept explained in the solution above, followed by step-by-step calculation and elimination of options.

Which concept is tested in this question?

This question tests fundamental concepts commonly asked in XAT exams.

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XAT 2021 - Dm Question 20

This is a detailed step-by-step solution for XAT 2021 - Dm Question 20. Understand the concept, common mistakes, and expert tips to solve similar questions in XAT exam.

QADI

Since x² - y² = 20 and x, y, z are positive integers the only values possible are x = 6 and y = 4.

y³ - 2x² - 4x ≥ - 12

Keeping the values of x and y, we get z ≤ 1

=> z = 1

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